<SEC-DOCUMENT>0000947871-19-000973.txt : 20191217
<SEC-HEADER>0000947871-19-000973.hdr.sgml : 20191217
<ACCEPTANCE-DATETIME>20191217170125
ACCESSION NUMBER:		0000947871-19-000973
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		15
CONFORMED PERIOD OF REPORT:	20191216
ITEM INFORMATION:		Entry into a Material Definitive Agreement
ITEM INFORMATION:		Other Events
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20191217
DATE AS OF CHANGE:		20191217

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QUEST DIAGNOSTICS INC
		CENTRAL INDEX KEY:			0001022079
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MEDICAL LABORATORIES [8071]
		IRS NUMBER:				161387862
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12215
		FILM NUMBER:		191290433

	BUSINESS ADDRESS:	
		STREET 1:		500 PLAZA DRIVE
		CITY:			SECAUCUS
		STATE:			NJ
		ZIP:			07094
		BUSINESS PHONE:		9735202700

	MAIL ADDRESS:	
		STREET 1:		500 PLAZA DRIVE
		CITY:			SECAUCUS
		STATE:			NJ
		ZIP:			07094

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CORNING CLINICAL LABORATORIES INC
		DATE OF NAME CHANGE:	19960903
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">UNITED STATES</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6.6pt; text-align: center">WASHINGTON, DC 20549</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 4.4pt 0 0">Check the appropriate box below if the Form 8-K filing is
intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction
A.2. below):</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><span style="font-family: Wingdings"><span id="xdx_901_edei--WrittenCommunications_c20191216__20191216_zM3bx1XzbyBh"><ix:nonNumeric contextRef="From2019-12-16to2019-12-16" format="ixt:booleanfalse" name="dei:WrittenCommunications">o</ix:nonNumeric></span></span> &#160;Written communications
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt">Securities registered pursuant to Section 12(b) of the Act:</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">Indicate by check mark whether the registrant is an emerging growth
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Act of 1934 (&#167;240.12b-2 of this chapter).</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">If an emerging growth company, indicate by check mark if the registrant
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pursuant to Section 13(a) of the Exchange Act.&#160;&#160;&#160;&#160; <span style="font-family: Wingdings">o</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><b>Item 1.01 Entry into a Material Definitive Agreement</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">On December 16, 2019, Quest Diagnostics Incorporated (the
&#8220;Company&#8221;) issued $800,000,000 aggregate principal amount of 2.950% senior notes due 2030 (the &#8220;Notes&#8221;).</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">The Company will pay interest on the Notes on June 30 and
December 30 of each year, beginning on June 30, 2020.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">The Notes will mature on June 30, 2030. The Notes will be
the senior unsecured obligations of the Company and will rank equally with the Company&#8217;s other and future senior unsecured
obligations. The Notes will not be entitled to the benefit of any sinking fund.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">The Notes were issued pursuant to an indenture dated as of
June 27, 2001 among the Company, the guarantors (as defined therein) and The Bank of New York Mellon, as trustee (the &#8220;Trustee&#8221;),
as supplemented from time to time, and as further supplemented by a twentieth supplemental indenture dated as of December 16, 2019
between the Company and the Trustee (collectively, the &#8220;Indenture&#8221;). The Indenture contains covenants that, among other
things, will limit the ability of the Company and any subsidiary guarantors to create certain liens; enter into certain sale and
leaseback transactions; consolidate, merge or transfer all or substantially all of the Company&#8217;s assets and the assets of
the Company&#8217;s subsidiaries on a consolidated basis; incur indebtedness of non-guarantor subsidiaries; and make restricted
payments to certain non-guarantor subsidiaries. The Indenture provides for customary events of default. Upon a change of control
triggering event (as defined in the Indenture), the Company will be required to make an offer to purchase the Notes at a price
equal to 101% of their principal amount plus accrued and unpaid interest to, but excluding, the date of repurchase.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">The foregoing description of the Indenture does not purport
to be complete and is qualified in its entirety by reference to the text of the applicable agreements, each of which is included
as an exhibit to this Current Report on Form 8-K and incorporated by reference herein.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">A copy of the opinion of Shearman &#38; Sterling LLP, counsel
to the Company, relating to the legality of the Notes is filed as Exhibit 5.1 to this Report.</p>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 6pt 0 10pt"><b>Item 8.01 Other Events</b></p>


<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">On December 16, 2019, the Company notified The Bank of New York
Mellon, as trustee under the Indenture governing its $500,000,000 aggregate principal amount of 4.75% senior
notes due 2020 (the &#8220;4.75% Notes&#8221;) and $300,000,000 aggregate principal amount of 2.50% senior notes due
2020 (the &#8220;2.50% Notes&#8221;), that it will redeem all of the issued and outstanding 4.75% Notes and 2.50% Notes on
January 15, 2020 pursuant to the Indenture. The 4.75% Notes and 2.50% Notes will be redeemed at a redemption price
calculated in accordance with the Indenture, plus accrued and unpaid interest to, but excluding, the date of
redemption. This Current Report on Form 8-K is not a notice of redemption.</p>




<p style="font: 10pt Times New Roman, Times, Serif; margin: 6pt 0 10pt"><b>Item&#160;9.01 Financial Statements and Exhibits</b></p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: top">
    <td style="width: 9%; padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt">&#160;</td>
    <td style="width: 10%; padding-right: 5.75pt; padding-bottom: 10pt; padding-left: 5.75pt; text-align: left"><b><span style="text-decoration: underline">Exhibit</span></b></td>
    <td style="width: 81%; padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 12.6pt"><b><span style="text-decoration: underline">Description</span></b></td></tr>
<tr style="vertical-align: top">
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt">&#160;</td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt"><a href="http://www.sec.gov/Archives/edgar/data/1022079/000094787101500290/ex4-4_062801.txt">4.1</a></td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 12.6pt"><span style="font-family: inherit,serif"><a href="http://www.sec.gov/Archives/edgar/data/1022079/000094787101500290/ex4-4_062801.txt">Indenture dated as of June 27, 2001, among the Company, the Subsidiary Guarantors and the Trustee (filed as an Exhibit to the Company&#8217;s current report on Form 8-K (Date of Report: June 27, 2001) and incorporated herein by reference)</a></span></td></tr>
<tr style="vertical-align: top">
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt">&#160;</td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt"><a href="ss160605_ex0402.htm" style="-sec-extract: exhibit">4.2*</a></td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 12.6pt"><span style="font-family: inherit,serif"><a href="ss160605_ex0402.htm" style="-sec-extract: exhibit">Twentieth Supplemental Indenture, dated as of December 16, 2019, between the Company and the Trustee</a></span></td></tr>
<tr style="vertical-align: top">
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt">&#160;</td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt"><a href="ss160605_ex0402.htm" style="-sec-extract: exhibit">4.3*</a></td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 12.6pt"><a href="ss160605_ex0402.htm" style="-sec-extract: exhibit">Form of the Company&#8217;s 2.950% Senior Note due 2030 (incorporated by reference from Exhibit A to Exhibit 4.2 hereof)</a></td></tr>
<tr style="vertical-align: top">
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt">&#160;</td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt"><a href="ss160605_ex0501.htm" style="-sec-extract: exhibit">5.1*</a></td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 12.6pt"><a href="ss160605_ex0501.htm" style="-sec-extract: exhibit">Opinion of Shearman &#38; Sterling LLP, counsel to the Company</a></td></tr>
<tr style="vertical-align: top">
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt">&#160;</td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt"><a href="ss160605_ex0501.htm" style="-sec-extract: exhibit">23.1*</a></td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 12.6pt"><a href="ss160605_ex0501.htm" style="-sec-extract: exhibit">Consent of Shearman &#38; Sterling LLP (included in Exhibit 5.1)</a></td></tr>
<tr style="vertical-align: top">
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt">&#160;</td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 5.75pt">104*</td>
    <td style="padding-right: 5.75pt; padding-bottom: 0.1in; padding-left: 12.6pt">The cover page from this current report on Form 8-K, formatted in Inline XBRL.</td></tr>
</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">* &#160;&#160;&#160;&#160;&#160;&#160;&#160;Filed herewith.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: center"><b>Signature</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Pursuant to the requirements of the
Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto
duly authorized.</p>

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<tr style="vertical-align: top">
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    <td colspan="2" style="padding-bottom: 10pt">December 17, 2019</td></tr>
<tr style="vertical-align: top">
    <td style="padding-bottom: 10pt">&#160;</td>
    <td colspan="2" style="padding-bottom: 10pt">QUEST DIAGNOSTICS INCORPORATED</td></tr>
<tr style="vertical-align: top">
    <td style="width: 45%">&#160;</td>
    <td style="width: 5%">&#160;</td>
    <td style="width: 50%">&#160;</td></tr>
<tr style="vertical-align: top">
    <td>&#160;</td>
    <td>By:</td>
    <td style="border-bottom: Black 1pt solid">/s/ William J. O&#8217;Shaughnessy, Jr.</td></tr>
<tr style="vertical-align: top">
    <td>&#160;</td>
    <td>&#160;</td>
    <td>William J. O&#8217;Shaughnessy, Jr.</td></tr>
<tr style="vertical-align: top">
    <td style="padding-bottom: 10pt">&#160;</td>
    <td style="padding-bottom: 10pt">&#160;</td>
    <td style="padding-bottom: 10pt"><span style="font-family: inherit,serif">Deputy General Counsel and Corporate Secretary</span></td></tr>
</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">&#160;</p>

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<DOCUMENT>
<TYPE>EX-4.2
<SEQUENCE>2
<FILENAME>ss160605_ex0402.htm
<DESCRIPTION>TWENTIETH SUPPLEMENTAL INDENTURE
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
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<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0; text-align: right"><B>Exhibit 4.2</B></P>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 48pt; text-align: right"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">______________________________________________________________________________<BR>
<BR>
<BR>
QUEST DIAGNOSTICS INCORPORATED,<BR>
<BR>
as Issuer<BR>
<BR>
and<BR>
<BR>
THE BANK OF NEW YORK MELLON,<BR>
<BR>
as Trustee<BR>
<BR>
<BR>
Twentieth Supplemental Indenture<BR>
<BR>
<BR>
Dated as of December 16, 2019<BR>
<BR>
<B>__________________________________________________________________</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><FONT STYLE="text-transform: uppercase"><B>TABLE
OF CONTENTS</B></FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: right">Page</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 12pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD COLSPAN="3" STYLE="padding-bottom: 12pt"><FONT STYLE="text-transform: uppercase">Article&nbsp;I. DEFINITIONS</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="text-transform: uppercase">3</FONT></TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="width: 8%; padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="width: 28%; padding-bottom: 12pt">SECTION&nbsp;1.1.</TD>
    <TD STYLE="width: 57%; padding-bottom: 12pt">Certain Terms Defined in the Indenture.</TD>
    <TD STYLE="width: 7%; padding-bottom: 12pt; text-align: right">3</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;1.2.</TD>
    <TD STYLE="padding-bottom: 12pt">Definitions.</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">3</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;1.3.</TD>
    <TD STYLE="padding-bottom: 12pt">Other Definitions</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">6</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD COLSPAN="3" STYLE="padding-bottom: 12pt"><FONT STYLE="text-transform: uppercase">Article&nbsp;II. FORM AND TERMS OF THE NOTES</FONT></TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right"><FONT STYLE="text-transform: uppercase">6</FONT></TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.1.</TD>
    <TD STYLE="padding-bottom: 12pt">Form and Dating</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">6</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.2.</TD>
    <TD STYLE="padding-bottom: 12pt">Terms of the Notes</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">8</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.3.</TD>
    <TD STYLE="padding-bottom: 12pt">Application of the Article of the Indenture Regarding Redemption of Securities</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">9</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.4.</TD>
    <TD STYLE="padding-bottom: 12pt">Application of the Article of the Indenture Relating to a Sinking Fund</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">9</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.5.</TD>
    <TD STYLE="padding-bottom: 12pt">Additional Events of Default</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">9</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.6.</TD>
    <TD STYLE="padding-bottom: 12pt">Application of the Article of the Indenture Regarding Defeasance and Covenant Defeasance</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">9</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.7.</TD>
    <TD STYLE="padding-bottom: 12pt">Application of the Article of the Indenture Regarding Repayment at the Option of Holders</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">10</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.8.</TD>
    <TD STYLE="padding-bottom: 12pt">Limitations on Subsidiary Indebtedness and Preferred Stock</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">10</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.9.</TD>
    <TD STYLE="padding-bottom: 12pt">Limitations on Liens</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">10</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.10.</TD>
    <TD STYLE="padding-bottom: 12pt">Repurchase of Notes Upon a Change of Control</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">10</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.11.</TD>
    <TD STYLE="padding-bottom: 12pt">Additional Guarantees</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">12</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;2.12.</TD>
    <TD STYLE="padding-bottom: 12pt">Exempted Liens and Sale and Leaseback Transactions</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">12</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD COLSPAN="3" STYLE="padding-bottom: 12pt"><FONT STYLE="text-transform: uppercase">Article&nbsp;III. MISCELLANEOUS</FONT></TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right"><FONT STYLE="text-transform: uppercase">13</FONT></TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;3.1.</TD>
    <TD STYLE="padding-bottom: 12pt">Governing Law</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">13</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;3.2.</TD>
    <TD STYLE="padding-bottom: 12pt">Separability</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">13</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;3.3.</TD>
    <TD STYLE="padding-bottom: 12pt">Counterparts</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">13</TD></TR>
</TABLE>

<P STYLE="margin: 0">&nbsp;</P>
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<TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 12pt; width: 8%">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt; width: 28%">SECTION&nbsp;3.4.</TD>
    <TD STYLE="padding-bottom: 12pt; width: 57%">Ratification</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right; width: 7%">13</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;3.5.</TD>
    <TD STYLE="padding-bottom: 12pt">Waiver of Jury Trial</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">14</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;3.6.</TD>
    <TD STYLE="padding-bottom: 12pt">Force Majeure</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">14</TD></TR>
<TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 12pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 12pt">SECTION&nbsp;3.7.</TD>
    <TD STYLE="padding-bottom: 12pt">Effectiveness</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">14</TD></TR>
<TR STYLE="vertical-align: top; background-color: White">
    <TD COLSPAN="3" STYLE="padding-bottom: 12pt">EXHIBIT&nbsp;A &mdash; Form of 2.950% Senior Note due 2030</TD>
    <TD STYLE="padding-bottom: 12pt; text-align: right">A-1</TD></TR>
</TABLE>
<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">TWENTIETH SUPPLEMENTAL INDENTURE</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">TWENTIETH SUPPLEMENTAL INDENTURE (this
&ldquo;Twentieth Supplemental Indenture&rdquo;), dated as of December 16, 2019, between QUEST DIAGNOSTICS INCORPORATED, a Delaware
corporation (the &ldquo;Company&rdquo;), and THE BANK OF NEW YORK MELLON, a New York banking corporation, as Trustee (the &ldquo;Trustee&rdquo;).</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">RECITALS OF THE COMPANY</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">WHEREAS, the Company, the Trustee and the
Initial Subsidiary Guarantors (as defined therein) executed and delivered an Indenture, dated as of June&nbsp;27, 2001 (the &ldquo;Base
Indenture&rdquo;), as supplemented by the first supplemental indenture, dated as of June&nbsp;27, 2001, among the Company, the
Initial Subsidiary Guarantors (as defined therein) party thereto, and the Trustee (the &ldquo;First Supplemental Indenture&rdquo;),
as further supplemented by a second supplemental indenture, dated as of November&nbsp;26, 2001, among the Company, the Subsidiary
Guarantors (as defined therein) party thereto and the Trustee (the &ldquo;Second Supplemental Indenture&rdquo;), as further supplemented
by a third supplemental indenture, dated as of April&nbsp;4, 2002, among the Company, the Subsidiary Guarantors (as defined therein)
party thereto and the Trustee (the &ldquo;Third Supplemental Indenture&rdquo;), as further supplemented by a fourth supplemental
indenture, dated as of March&nbsp;19, 2003, among the Company, the Subsidiary Guarantors (as defined therein) party thereto and
the Trustee (the &ldquo;Fourth Supplemental Indenture&rdquo;), as further supplemented by a fifth supplemental indenture, dated
as of April&nbsp;16, 2004, among the Company, the Subsidiary Guarantors (as defined therein) party thereto and the Trustee (the
&ldquo;Fifth Supplemental Indenture&rdquo;), as further supplemented by a sixth supplemental indenture dated October&nbsp;31, 2005,
among the Company, the Subsidiary Guarantors (as defined therein) party thereto (the &ldquo;Sixth Supplemental Indenture&rdquo;),
as further supplemented by a seventh supplemental indenture dated November&nbsp;21, 2005, among the Company, the Subsidiary Guarantors
(as defined therein) party thereto and the Trustee (the &ldquo;Seventh Supplemental Indenture&rdquo;), as further supplemented
by an eighth supplemental indenture dated July&nbsp;31, 2006, among the Company, the Subsidiary Guarantors (as defined therein)
party thereto and the Trustee (the &ldquo;Eighth Supplemental Indenture&rdquo;), as further supplemented by a ninth supplemental
indenture, dated as of September&nbsp;30, 2006, among the Company, the Subsidiary Guarantors (as defined therein) party thereto
and the Trustee (the &ldquo;Ninth Supplemental Indenture&rdquo;), as further supplemented by a tenth supplemental indenture, dated
as of June&nbsp;22, 2007, among the Company, the Subsidiary Guarantors (as defined therein) party thereto and the Trustee (the
&ldquo;Tenth Supplemental Indenture&rdquo;), as further supplemented by an eleventh supplemental indenture, dated as of June&nbsp;22,
2007, among the Company, the Subsidiary Guarantors (as defined therein) party thereto and the Trustee (the &ldquo;Eleventh Supplemental
Indenture&rdquo;), as further supplemented by a twelfth supplemental indenture, dated as of June&nbsp;25, 2007, among the Company,
the Subsidiary Guarantors (as defined therein) party thereto and the Trustee (the &ldquo;Twelfth Supplemental Indenture&rdquo;),
as further supplemented by a thirteenth supplemental indenture, dated as of November&nbsp;17, 2009, among the Company, the Subsidiary
Guarantors (as defined therein) party thereto and the Trustee (the &ldquo;Thirteenth Supplemental Indenture&rdquo;), as further
supplemented by a fourteenth supplemental indenture, dated as of March&nbsp;24, 2011, among the Company, the Subsidiary Guarantors
(as defined therein) party thereto and the Trustee (the &ldquo;Fourteenth Supplemental Indenture&rdquo;), as further supplemented
by the fifteenth supplemental indenture, dated as of November&nbsp;30, 2011, among the Company, the Additional Subsidiary Guarantors
(as defined therein) and the Trustee (the &ldquo;Fifteenth Supplemental Indenture&rdquo;), as further supplemented by the sixteenth
supplemental indenture, dated as of March 17, 2014, between the Company and the Trustee (the &ldquo;Sixteenth Supplemental Indenture&rdquo;),
as further supplemented by the seventeenth supplemental indenture, dated as of March 10, 2015, between the Company and the Trustee
(the &ldquo;Seventeenth Supplemental Indenture&rdquo;), as further supplemented by the eighteenth supplemental indenture, dated
as of May 26, 2016, between the Company and the Trustee (the &ldquo;Eighteenth Supplemental Indenture&rdquo;), as further supplemented
by the nineteenth supplemental indenture, dated as of March 12, 2019, between the Company and the Trustee (the &ldquo;Nineteenth
Supplemental Indenture&rdquo;) and as to be further supplemented by this Twentieth Supplemental Indenture (collectively, the &ldquo;Indenture&rdquo;),
to provide for the issuance by the Company from time to time of Securities to be issued in one or more series as provided in the
Indenture;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">WHEREAS, the issuance and sale of $800,000,000
aggregate principal amount of a new series of the Company&rsquo;s 2.950% Senior Notes due 2030 (the &ldquo;Notes&rdquo;) pursuant
to this Twentieth Supplemental Indenture have been authorized by resolutions adopted by the Board of Directors of the Company;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">WHEREAS, the Company desires to issue and
sell $800,000,000 aggregate principal amount of the Notes pursuant to this Twentieth Supplemental Indenture on the date hereof;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">WHEREAS, Sections&nbsp;901(7) and 901(9)
of the Indenture provide that without the consent of the Holders of the Securities of any series issued under the Indenture, the
Company, when authorized by a Board Resolution, and the Trustee may enter into one or more indentures supplemental to the Indenture
to (a)&nbsp;establish the form or terms of Securities of any series and any related coupons as permitted by Sections&nbsp;201 and
301, including the provisions and procedures relating to Securities convertible into or exchangeable for any securities of any
Person (including the Company) and (b)&nbsp;cure any ambiguity, to correct or supplement any provision therein which may be inconsistent
with any other provision therein, or make any other provisions with respect to matters or questions arising under the Base Indenture;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">WHEREAS, the Company desires to establish
the form and terms of the Notes;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">WHEREAS, all things necessary to make this
Twentieth Supplemental Indenture a valid supplement to the Indenture according to its terms and the terms of the Indenture have
been done;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">NOW, THEREFORE, for and in consideration
of the premises stated herein and the purchase of the Notes by the Holders thereof, the parties hereto hereby enter into this Twentieth
Supplemental Indenture, for the equal and proportionate benefit of all Holders of the Notes, as follows:</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">&nbsp;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><FONT STYLE="text-transform: uppercase"><B>Article&nbsp;I.<BR>
<BR>
DEFINITIONS</B></FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;1.1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Certain Terms Defined
in the Indenture</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">All capitalized terms used but not defined
herein shall have the meanings ascribed to such terms in the Indenture, as amended through the date hereof, other than such terms
as are defined in the Second Supplemental Indenture.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;1.2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Definitions</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided in a Future Supplemental
Indenture, for the benefit of the Holders of the Notes, Section&nbsp;101 of the Indenture shall be amended by adding the following
new definitions or, to the extent already defined in the Indenture, replacing existing definitions with the following:</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Change of Control&rdquo; means
the occurrence of any of the following: (1)&nbsp;the consummation of any transaction (including, without limitation, any merger
or consolidation) the result of which is that any &ldquo;person&rdquo; (as that term is used in Section&nbsp;13(d)&nbsp;(3)&nbsp;of
the Exchange Act) (other than the Company or one of its subsidiaries) becomes the beneficial owner (as defined in Rules 13d-3 and
13d-5 under the Exchange Act), directly or indirectly, of more than 50% of the Voting Stock of the Company or other Voting Stock
into which the Voting Stock of the Company is reclassified, consolidated, exchanged or changed, measured by voting power rather
than number of shares; (2)&nbsp;the direct or indirect sale, transfer, conveyance or other disposition (other than by way of merger
or consolidation), in one or more series of related transactions, of all or substantially all of the assets of the Company and
the assets of its subsidiaries, taken as a whole, to one or more &ldquo;persons&rdquo; (as that term is used in Section 13(d)(3)
of the Exchange Act) (other than the Company or one of its subsidiaries); or (3)&nbsp;the first day on which a majority of the
members of the Board of Directors of the Company are not Continuing Directors. Notwithstanding the foregoing, a transaction will
not be deemed to involve a Change of Control if (1)&nbsp;the Company becomes a direct or indirect wholly-owned subsidiary of a
holding company and (2)(A)&nbsp;the direct or indirect holders of the Voting Stock of such holding company immediately following
that transaction are substantially the same as the holders of the Voting<BR>
Stock of the Company immediately prior to that transaction or (B)&nbsp;immediately following that transaction no person (other
than a holding company satisfying the requirements of this sentence) is the beneficial owner, directly or indirectly, of more than
50% of the Voting Stock of such holding company.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Change of Control Triggering Event&rdquo;
means the occurrence of both a Change of Control and a Rating event.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Comparable Treasury Issue&rdquo;
means the United States Treasury security selected by an Independent Investment Banker as having a maturity comparable to the remaining
term of the Notes to be redeemed (assuming the Notes matured on the Par Call Date) that would be utilized, at the time of selection
and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity
to the remaining term of the Notes.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Comparable Treasury Price&rdquo;
means, with respect to any redemption date for the Notes:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.5in"><FONT STYLE="font-family: Symbol">&#183;</FONT></TD><TD>the average of four&nbsp;Reference Treasury Dealer Quotations for that redemption date, after excluding the highest and lowest
of such Reference Treasury Dealer Quotations; or</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.5in"><FONT STYLE="font-family: Symbol">&#183;</FONT></TD><TD>if the Company obtains fewer than four&nbsp;Reference Treasury Dealer Quotations, the average of all quotations obtained by
the Company.</TD></TR></TABLE>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Continuing Directors&rdquo; means,
as of any date of determination, any member of the Company&rsquo;s Board of Directors who (1)&nbsp;was a member of such Board of
Directors on the date the Notes were issued or (2)&nbsp;was nominated for election, elected or appointed to such Board of Directors
with the approval of a majority of the Continuing Directors who were members of such Board of Directors at the time of such nomination,
election or appointment (either by a specific vote or by approval of the proxy statement of the Company in which such member was
named as a nominee for election as a director, without objection to such nomination).</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Existing Receivables Credit Facility&rdquo;
means the receivables-backed financing transaction pursuant to (1)&nbsp;the Fourth Amended and Restated Receivables Sale Agreement,
dated as of October 28, 2015, between the Company and each of its direct and indirect wholly owned Subsidiaries that is a seller
thereunder, and Quest Diagnostics Receivables Inc., as the buyer, as amended, (2)&nbsp;the Sixth Amended and Restated Credit and
Security Agreement, dated as of October&nbsp;27, 2017, among Quest Diagnostics Receivables Inc., as borrower, the Company, as initial
servicer, each of the lenders from time to time party thereto, and The Bank of Tokyo-Mitsubishi UFJ, Ltd., New York Branch, as
administrative agent, as amended and (3)&nbsp;the various related ancillary documents.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Fitch&rdquo; means Fitch Ratings,
Inc.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Global Notes&rdquo; means, individually
and collectively, each of the Global Notes, substantially in the form of <U>Exhibit&nbsp;A</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Global Notes Legend&rdquo; means
the legend set forth in Section&nbsp;204 to be placed on all Global Notes issued under this Indenture.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Investment Grade Rating&rdquo;
means a rating equal to or higher than Baa3 (or the equivalent) by Moody&rsquo;s, BBB&ndash; (or the equivalent) by S&amp;P and
BBB&ndash; (or the equivalent) by Fitch, and the equivalent investment grade credit rating from any additional rating agency or
Rating Agencies selected by the Company.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Moody&rsquo;s&rdquo; means Moody&rsquo;s
Investors Service, Inc.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Rating Agencies&rdquo; means (1)&nbsp;each
of Moody&rsquo;s, S&amp;P and Fitch; and (2)&nbsp;if any of Moody&rsquo;s, S&amp;P or Fitch ceases to rate the Notes or fails to
make a rating of the Notes publicly available for reasons outside of the control of the Company, a &ldquo;nationally recognized
statistical rating organization&rdquo; within the meaning of Section 3(a)(62) of the Exchange Act selected by the Company (as certified
by a resolution of the Board of Directors) as a replacement agency for Moody&rsquo;s, S&amp;P or Fitch, or all of them, as the
case may be.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Rating event&rdquo; means the
rating on the Notes is lowered by at least two of the Rating Agencies and the Notes are rated below an Investment Grade Rating
by at least two of the Rating Agencies on any day within the 60-day period (which 60-day period shall be extended so long as the
rating of the Notes is under publicly announced consideration for a possible downgrade by any of the Rating Agencies) after the
earlier of (1)&nbsp;the occurrence of a Change of Control and (2)&nbsp;public notice of the occurrence of a Change of Control or
the intention of the Company to effect a Change of Control; <I>provided</I>, <I>however</I>, that a Rating event otherwise arising
by virtue of a particular reduction in rating will not be deemed to have occurred in respect of a particular Change of Control
(and thus will not be deemed a Rating event for purposes of the definition of Change of Control Triggering Event) if the Rating
Agencies making the reduction in rating to which this definition would otherwise apply do not announce or publicly confirm or inform
the trustee in writing at its request or the request of the Company that the reduction was the result, in whole or in part, of
any event or circumstance comprised of or arising as a result of, or in respect of, the applicable Change of Control (whether or
not the applicable Change of Control has occurred at the time of the Rating event).</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Par Call Date&rdquo; means March
30, 2030.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Remaining Scheduled Payments&rdquo;
means, with respect to the Notes, the remaining scheduled payments of the principal thereof and interest thereon from the redemption
date through the Par Call Date; <I>provided</I>, <I>however</I>, that, if such redemption date is not an interest payment date
with respect to the Notes, the amount of the next succeeding scheduled interest payment thereon will be deemed to be reduced by
the amount of interest accrued thereon to such redemption date.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;S&amp;P&rdquo; means S&amp;P Global
Ratings, a division of S&amp;P Global Inc.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Subsidiary Guarantor&rdquo; means,
at any time, each existing and future domestic Subsidiary of the Company that may guarantee the Notes; <I>provided</I> that such
Subsidiary continues to guarantee the Notes at such time.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Treasury Rate&rdquo; means, with
respect to any redemption date for the Notes, the rate per annum equal to the semiannual equivalent yield to maturity or interpolation
(on a day count basis) of the interpolated Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed
as a percentage of its principal amount) equal to the Comparable Treasury Price for such redemption date, as determined by the
Company or an Independent Investment Banker appointed by the Company.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&ldquo;Voting Stock&rdquo; means, with
respect to any specified &ldquo;person&rdquo; (as that term is used in Section&nbsp;13(d)(3)&nbsp;of the Exchange Act) as of any
date, the capital stock of such person that is at the time entitled to vote generally in the election of the board of directors
of such person.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;1.3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Other Definitions</U>.</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 65%; padding-right: 5.4pt; padding-left: 5.4pt"><U>Term</U></TD>
    <TD STYLE="width: 35%; padding-right: 5.4pt; padding-left: 5.4pt"><U>Defined in Section</U></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&ldquo;Additional Notes&rdquo;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">2.2(a)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&ldquo;Change of Control Offer&rdquo;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">2.10</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&ldquo;Change of Control Payment&rdquo;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">2.10</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&ldquo;Change of Control Payment Date&rdquo;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">2.10</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&ldquo;Depository&rdquo;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">2.1(a)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&ldquo;Maturity&rdquo;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">2.2(c)</TD></TR>
</TABLE>
<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><FONT STYLE="text-transform: uppercase"><B>Article&nbsp;II.<BR>
<BR>
FORM AND TERMS OF THE NOTES</B></FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Form and Dating</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">The Notes and the Trustee&rsquo;s certificate
of authentication shall be substantially in the form of <U>Exhibit&nbsp;A</U> attached hereto. The Notes shall be executed on behalf
of the Company by its Chief Executive Officer, the Chief Financial Officer, the Controller or the Treasurer and the Secretary,
under its corporate seal reproduced thereon. The Notes may have notations, legends or endorsements required by law, stock exchange
rules or usage. Each Note shall be dated the date of its authentication. The Notes and any beneficial interest in the Notes shall
be in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">The terms and notations contained in the
Notes shall constitute, and are hereby expressly made, a part of this Indenture and the Company and the Trustee, by their execution
and delivery of this Indenture, expressly agree to such terms and provisions and to be bound thereby.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Global
Notes. The Global Notes designated herein shall be issued initially in the form of one or more fully registered global notes, which
shall be deposited on behalf of the purchasers of the Notes represented thereby with the Depository Trust Company, New York, New
York (the &ldquo;Depository&rdquo;) and registered in the name of Cede &amp; Co., the Depository&rsquo;s nominee, duly executed
by the Company and authenticated by the Trustee. The aggregate principal amount of outstanding Notes may from time to time be increased
or decreased by adjustments made on the records of the Trustee and the Depository or its nominee as hereinafter provided.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">The Global Notes may not be transferred
except by the Depository, in whole and not in part, to another nominee of the Depository or to a successor of the Depository or
its nominee. If at any time the Depository for the Notes notifies the Company that the Depository is unwilling, unable or ineligible
to continue as depository for the Global Notes and a successor depository for the Global Notes is not appointed by the Company
within 90&nbsp;days after delivery of such notice, then the Company shall execute, and the Trustee shall, upon receipt of a Company
Order, for authentication, authenticate and deliver, Definitive Notes in an aggregate principal amount equal to the principal amount
of the Global Notes in exchange for such Global Note.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Book-Entry
Provisions. This Section&nbsp;2.1(b) shall apply only to the Global Notes deposited with or on behalf of the Depository.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">The Company shall execute and the
Trustee shall, in accordance with this Section&nbsp;2.1(b), authenticate and deliver the Global Notes that shall be registered
in the name of the Depository or the nominee of the Depository and shall be delivered by the Trustee to the Depository or pursuant
to the Depository&rsquo;s instructions.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">Depository Participants shall have
no rights either under this Indenture or with respect to any Global Notes held on their behalf by the Depository or under such
Global Notes. The Depository shall be treated by the Company, the Trustee and any agent of the Company or the Trustee as the absolute
owner of such Global Note for all purposes under this Indenture. Notwithstanding the foregoing, nothing herein shall prevent the
Company or the Trustee from giving effect to any written certification, proxy or other authorization furnished by the Depository
or impair, as between the Depository and the Depository Participants, the operation of customary practices of such Depository governing
the exercise of the rights of an owner of a beneficial interest in the Global Notes.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Definitive
Notes. Notes issued in certificated form shall be substantially in the form of <U>Exhibit&nbsp;A</U>, attached hereto, but without
including the text referred to therein as applying only to Global Notes. Except as provided above in subsection&nbsp;(a), owners
of beneficial interests in the Global Notes will not be entitled to receive physical delivery of certificated Notes.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transfer
and Exchange of the Notes. The transfer and exchange of beneficial interests in the Global Notes shall be effected through the
Depository, in accordance with this Indenture and the procedures of the Depository therefor. Beneficial interests in the Global
Notes may be transferred to Persons who take delivery thereof in the form of a beneficial interest in the Global Notes.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(e)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Paying
Agent. The Company appoints The Bank of New York Mellon as agent of the Company for the payment of the principal of (and premium,
if any) and interest on the Notes; and that the Corporate Trust Office of The Bank of New York Mellon in the Borough of Manhattan,
the City of New York, be and hereby is, designated as the office or agency in the Borough of Manhattan where the Notes may be presented
for payment and where notices to or demands upon the Company in respect of the Notes and the Indenture pursuant to which the Notes
are to be issued may be served.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Terms of the Notes</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">The following terms relating to the Notes
are hereby established:</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Notes shall constitute a series of Securities having the title &ldquo;Senior Notes due 2030.&rdquo;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
aggregate principal amount of the Notes that may be initially authenticated and delivered under the Indenture (except for Notes
authenticated and delivered upon registration of, transfer of or in exchange for, or in lieu of, other Notes pursuant to Sections&nbsp;304,
305, 306, 906 or 1107 of the Indenture) shall be $800,000,000. The Company may from time to time, without the consent of the Holders
of the Notes, issue additional Notes (&ldquo;Additional Notes&rdquo;) having the same ranking and the same interest rate, maturity
and other terms as the Notes. Any Additional Notes and the existing Notes will constitute a single series under the Indenture and
all references to the Notes shall include the Additional Notes unless the context otherwise requires.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
entire outstanding principal of the Notes shall be payable on June 30, 2030 (the &ldquo;Maturity&rdquo;).</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
rate at which the Notes shall bear interest shall be 2.950% per annum, and the date from which interest shall accrue on the Notes
shall be December 16, 2019, or the most recent Interest Payment Date to which interest has been paid or provided for; the Interest
Payment Dates for the Notes shall be June 30 and December 30 of each year, beginning June 30,&nbsp;2020; the interest so payable,
and punctually paid or duly provided for, on any Interest Payment Date, will be paid, in immediately available funds, to the Persons
in whose names the Notes (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date
for such interest, which shall be June 15 or December 15, as the case may be, next preceding such Interest Payment Date. Interest
on the Notes will be computed on the basis of a 360-day year of twelve 30-day months. Any such interest not punctually paid or
duly provided for shall forthwith cease to be payable to the Holders on such Regular Record Date, and such Defaulted Interest,
may be paid to the Persons in whose names the Notes (or one or more Predecessor Securities) is registered at the close of business
on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to
Holders of Notes not less than ten days prior to such Special Record Date, or may be paid at any time in any other lawful manner
not inconsistent with requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be
required by such exchange, all as more fully provided in said Indenture. Payment of principal and interest on the Notes will be
made at the Corporate Trust Office of the Trustee or such other office or agency of the Company as may be designated for such purpose,
in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private
debts; <I>provided</I>, <I>however</I>, that each installment of interest and principal on the Notes may at the Company&rsquo;s
option be paid in immediately available funds by transfer to an account maintained by the payee located in the United States.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(e)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Notes shall be issuable in whole in the registered form of one or more Global Notes (without coupons), and the Depository for such
Global Notes shall be The Depository Trust Company, New York, New York.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(f)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
references to &ldquo;30 days&rdquo; in the first sentence of Section 1104 shall be replaced with &ldquo;15 days.&rdquo;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(g)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
words &ldquo;prior to the Par Call Date&rdquo; shall be inserted in the first sentence of Section 1108, immediately following the
phrase &ldquo;At any time and from time to time&rdquo; and immediately preceding the phrase &ldquo;, the Securities of any series.&rdquo;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(h)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
following sentence shall be inserted immediately following clause (b) of the first sentence of Section 1108: &ldquo;On or after
the Par Call Date, the Notes may be redeemed, as a whole at any time or in part from time to time, at the option of the Company,
on at least 15 days, but not more than 60 days, prior notice mailed to the registered address of each holder of the Notes, at a
redemption price equal to 100% of the principal amount of the Notes being redeemed.&rdquo;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(i)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Redemption Amount of Basis Points applicable to the Notes used to calculate the Redemption Price pursuant to Section&nbsp;1108
of this Indenture shall be 20&nbsp;basis points.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Application of
the Article of the Indenture Regarding Redemption of Securities</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided in a Future Supplemental
Indenture, the provisions of Article&nbsp;Eleven of the Indenture, as amended (including as amended hereby), shall apply to the
Notes.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Application of
the Article of the Indenture Relating to a Sinking Fund</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided in a Future Supplemental
Indenture, the Notes shall not be entitled to the benefit of any sinking fund, and the provisions of the Indenture relating to
a sinking fund, including Article&nbsp;Twelve and Subsection&nbsp;(3) of Section&nbsp;501 of the Indenture, shall not apply to
the Notes.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Additional Events
of Default</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided by a Future Supplemental
Indenture, for the benefit of the holders of the Notes, Section&nbsp;501(7)(A) of the Indenture shall be amended by deleting the
words &ldquo;$100 million&rdquo; in the second line thereof and, in their place, adding the words &ldquo;$200&nbsp;million&rdquo;;
and Section&nbsp;501(7)(B) of the Indenture shall be amended by deleting the words &ldquo;$100&nbsp;million&rdquo; in the sixth
line thereof and, in their place, adding the words &ldquo;$200&nbsp;million.&rdquo;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Application of
the Article of the Indenture Regarding Defeasance and Covenant Defeasance</U>.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided by a Future Supplemental
Indenture, the provisions of Article&nbsp;Fourteen of the Indenture, including the provisions relating to defeasance and covenant
defeasance of the Securities under Sections&nbsp;1402 and 1403, respectively, of the Indenture shall apply to the Notes.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Application of
the Article of the Indenture Regarding Repayment at the Option of Holders</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided by a Future Supplemental
Indenture, the provisions of Article&nbsp;Thirteen of the Indenture shall not apply to the Notes.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Limitations on
Subsidiary Indebtedness and Preferred Stock</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Except
as may be provided by a Future Supplemental Indenture, for the sole benefit of the holders of the Notes, Section&nbsp;1011(a) of
the Indenture shall be amended by deleting the words &ldquo;First Supplemental Indenture&rdquo; in the second line thereof and,
in their place, adding the words &ldquo;Twentieth Supplemental Indenture.&rdquo;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Except
as may be provided by a Future Supplemental Indenture, for the sole benefit of the holders of the Notes, Section&nbsp;1011 of the
Indenture shall be amended by adding a new subsection&nbsp;1011(k) and subsection&nbsp;1011(l) as follows:</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.8in">&#9;(k)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;any guarantee of Indebtedness
of the Company by any Subsidiary of the Company in anticipation of such Subsidiary becoming a Subsidiary Guarantor pursuant to
Article&nbsp;Sixteen of the Indenture; or</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.8in">&#9;(l)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;shares of Preferred
Stock held by the Company or a subsidiary of the Company.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Limitations on
Liens</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided by a Future Supplemental
Indenture, for the sole benefit of the holders of the Notes, Section&nbsp;1008(a) of the Indenture shall be amended by deleting
the words &ldquo;First Supplemental Indenture&rdquo; in the first and second line thereof and, in their place, adding the words
&ldquo;Twentieth Supplemental Indenture.&rdquo;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.10.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Repurchase of
Notes Upon a Change of Control</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided by a Future Supplemental
Indenture, for the benefit of the holders of the Notes, a new Section&nbsp;315 shall be added to the Indenture as follows:</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">Section&nbsp;315&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;Repurchase
of Notes Upon a Change of Control.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
a Change of Control Triggering Event occurs, unless the Company has exercised its option to redeem the Notes as described in Section&nbsp;1108,
the Company shall make an offer to repurchase all or any part&nbsp;(equal to $2,000 or an integral multiple of $1,000 in excess
thereof) of the Notes pursuant to the offer described below (the &ldquo;Change of Control Offer&rdquo;) on the terms set forth
in the Notes. In the Change of Control Offer, the Company shall offer payment in cash equal to 101% of the aggregate principal
amount of Notes repurchased, plus accrued and unpaid interest, if any, on the Notes repurchased to, but excluding, the date of
repurchase (the &ldquo;Change of Control Payment&rdquo;). Within 30&nbsp;days following any Change of Control Triggering Event
or, at the option of the Company, prior to any Change of Control, but after the public announcement of the transaction that constitutes
or may constitute the Change of Control, the Company shall mail a notice to holders of Notes describing the transaction that constitutes
or may constitute the Change of Control Triggering Event and offering to repurchase the Notes on the date specified in the notice,
which date will be no earlier than 30&nbsp;days and no later than 60&nbsp;days from the date such notice is mailed (the &ldquo;Change
of Control Payment Date&rdquo;). The notice shall, if mailed prior to the date of consummation of the Change of Control, state
that the offer to purchase is conditioned on the Change of Control Triggering Event occurring on or prior to the Change of Control
Payment Date.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company shall comply with the requirements of Rule&nbsp;14e-1 under the Exchange Act, and any other securities laws and regulations
thereunder to the extent those laws and regulations are applicable in connection with the repurchase of the Notes as a result of
a Change of Control Triggering Event. To the extent that the provisions of any such securities laws or regulations conflict with
the Change of Control provisions of the Notes, the Company will comply with the applicable securities laws and regulations and
will not be deemed to have breached its obligations under the Change of Control provisions of the Notes by virtue of any such conflict.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On
the Change of Control Payment Date, the Company shall, to the extent lawful:</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 1in; text-indent: 0.5in">(1)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;accept
for payment all Notes or portions of Notes properly tendered pursuant to the Change of Control Offer;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 1in; text-indent: 0.5in">(2)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;deposit
with the Paying Agent an amount equal to the Change of Control Payment in respect of all Notes or portions of Notes properly tendered;
and</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 1in; text-indent: 0.5in">(3)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;deliver
or cause to be delivered to the Trustee the Notes properly accepted together with an Officers&rsquo; Certificate stating the aggregate
principal amount of Notes or portions of Notes being purchased.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company shall not be required to make a Change of Control Offer upon the occurrence of a Change of Control Triggering Event if
a third party makes such an offer in the manner, at the times and otherwise in compliance with the requirements for an offer made
by the Company and the third party repurchases all Notes properly tendered and not withdrawn under its offer. In addition, the
Company shall not repurchase any Notes if there has occurred and is continuing on the Change of Control Payment Date an event of
default under this Indenture, other than a default in the payment of the Change of Control Payment upon a Change of Control Triggering
Event.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.11.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Additional Guarantees
and Release of Guarantees</U></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided by a Future Supplemental
Indenture, for the sole benefit of the holders of the Notes, Section 1604 and Section 1605 of the Indenture shall be amended by
deleting each in its entirety and, in their place, adding the following:</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION 1604 Additional Guarantees.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">If any future domestic Subsidiary
of the Company or any Subsidiary Guarantor which has been released and discharged from its obligations under its Subsidiary Guarantee
of the Notes pursuant to Section 1605 guarantees any of the following series of Securities of the Company pursuant to a requirement
to guarantee such Securities under the Indenture: 4.75% senior notes due 2020, 2.50% senior notes due 2020, 4.70% senior notes
due 2021, 4.25% senior notes due 2024, 3.50% senior notes due 2025, 3.45% senior notes due 2026, 4.20% senior notes due 2029, 6.95%
senior notes due 2037, 5.75% senior notes due 2040 or 4.70% senior notes due 2045, then the Company will cause such Subsidiary
to execute and deliver to the Trustee a supplemental indenture pursuant to which it will become a Subsidiary Guarantor under the
Twentieth Supplemental Indenture in a substantially consistent manner for so long as such Subsidiary guarantees any such series
of Securities.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">SECTION 1605 Release of Guarantees.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in; text-indent: 0.5in">The Subsidiary Guarantees of the
Subsidiary Guarantors with respect to the Notes will remain in effect with respect to each Subsidiary Guarantor until the entire
amount of principal of, premium, and interest on the Notes shall have been paid in full or otherwise discharged in accordance with
the provisions of the Indenture; provided, however, that if</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 1in">(a) all outstanding Indebtedness of such Subsidiary Guarantor
would have been permitted to be incurred pursuant to Section 1011 measured at the time of the release and discharge as described
in this Section 1605,</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 1in">(b) the Notes are defeased and discharged pursuant to
Article Fourteen hereof,</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 1in">(c) all or substantially all of the assets of such Subsidiary
Guarantor or all of the capital stock of such Subsidiary Guarantor is sold (including by issuance, merger, consolidation or otherwise)
by the Company or any of its Subsidiaries, or</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 1in">(d) the Subsidiary Guarantees of the Securities referred
to in Section 1604 have been released,</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt 0.5in">then in each case of (a), (b), (c), or (d) above, such
Subsidiary Guarantor or the corporation acquiring such assets (in the event of a sale or other disposition of all or substantially
all of the assets or capital stock of such Subsidiary Guarantor) shall be released and discharged from its obligations under its
Subsidiary Guarantee of the Notes.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;2.12.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Exempted Liens
and Sale and Leaseback Transactions</U>&nbsp;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Except as may be provided by a Future Supplemental
Indenture, for the sole benefit of the holders of the Notes, Section 1010 shall be amended by deleting &ldquo;5%&rdquo; and, in
its place, adding &ldquo;10%&rdquo;.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><FONT STYLE="text-transform: uppercase"><B>Article&nbsp;III.<BR>
<BR>
MISCELLANEOUS</B></FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;3.1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Governing Law</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">This Twentieth Supplemental Indenture and
the Notes shall be governed by and construed in accordance with the laws of the State of New York, without regard to principles
of conflicts of laws. This Twentieth Supplemental Indenture is subject to the provisions of the Trust Indenture Act that are required
to be part of this Indenture and shall, to the extent applicable, be governed by such provisions.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;3.2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Separability</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">In case any provision in this Twentieth
Supplemental Indenture or in any Securities, including the Notes, shall be invalid, illegal or unenforceable, the validity, legality
and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;3.3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Counterparts</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">This Twentieth Supplemental Indenture may
be executed in any number of counterparts, each of which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same Supplemental Indenture.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;3.4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Ratification</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">The Base Indenture, as supplemented and
amended by the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental
Indenture, the Fifth Supplemental Indenture, the Sixth Supplemental Indenture, the Seventh Supplemental Indenture, the Eighth Supplemental
Indenture, the Ninth Supplemental Indenture, the Tenth Supplemental Indenture, the Eleventh Supplemental Indenture, the Twelfth
Supplemental Indenture, the Thirteenth Supplemental Indenture, the Fourteenth Supplemental Indenture, the Fifteenth Supplemental
Indenture, the Sixteenth Supplemental Indenture, the Seventeenth Supplemental Indenture, the Eighteenth Supplemental Indenture,
the Nineteenth Supplemental Indenture and this Twentieth Supplemental Indenture is in all respects ratified and confirmed. The
Base Indenture, the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth
Supplemental Indenture, the Fifth Supplemental Indenture, the Sixth Supplemental Indenture, the Seventh Supplemental Indenture,
the Eighth Supplemental Indenture, the Ninth Supplemental Indenture, the Tenth Supplemental Indenture, the Eleventh Supplemental
Indenture, the Twelfth Supplemental Indenture, the Thirteenth Supplemental Indenture, the Fourteenth Supplemental Indenture, the
Fifteenth Supplemental Indenture, the Sixteenth Supplemental Indenture, the Seventeenth Supplemental Indenture, the Eighteenth
Supplemental Indenture, the Nineteenth Supplemental Indenture and this Twentieth Supplemental Indenture shall be read, taken and
construed as one and the same instrument. All provisions included in this Twentieth Supplemental Indenture supersede any conflicting
provisions included in the Base Indenture unless not permitted by law. The Trustee accepts the trusts created by the Indenture,
as supplemented by this Twentieth Supplemental Indenture, and agrees to perform the same upon the terms and conditions of the Indenture,
as supplemented by this Twentieth Supplemental Indenture.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;3.5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Waiver of Jury
Trial</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">EACH OF THE COMPANY AND THE TRUSTEE HEREBY
IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING
ARISING OUT OF OR RELATING TO THIS AGREEMENT, THE NOTES OR THE TRANSACTION CONTEMPLATED HEREBY.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;3.6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Force Majeure</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">In no event shall the Trustee be responsible
or liable for any failure or delay in the performance of its obligations hereunder arising out of or caused by, directly or indirectly,
forces beyond its control, including, without limitation, strikes, work stoppages, accidents, acts of war or terrorism, civil or
military disturbances, nuclear or natural catastrophes or acts of God and interruptions, loss or malfunctions of utilities, communications
or computer (software and hardware) services; it being understood that the Trustee shall use reasonable efforts which are consistent
with accepted practices in the banking industry to resume performance as soon as practicable under the circumstances.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">SECTION&nbsp;3.7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#9;<U>Effectiveness</U>.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">The provisions of this Twentieth Supplemental
Indenture shall become effective as of the date hereof.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">[Remainder of page intentionally left
blank.]</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">IN WITNESS WHEREOF, the parties hereto
have caused this Twentieth Supplemental Indenture to be duly executed as of the date first above written.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 12pt">QUEST DIAGNOSTICS INCORPORATED</P>
<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 12pt Times New Roman, Times, Serif; width: 100%">

<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 4%">&nbsp;</TD>
    <TD STYLE="width: 6%">&nbsp;</TD>
    <TD STYLE="width: 40%">&nbsp;</TD></TR>

<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>By:</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid;">/s/ Sandip Patel</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Name:&nbsp;&nbsp;</TD>
    <TD>Sandip Patel</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Title:</TD>
    <TD>Vice President &amp; Treasurer</TD></TR>
</TABLE>
<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 0 2.5in"><BR></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0">Twentieth Supplemental Indenture</P>



<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">THE BANK OF NEW YORK MELLON,<BR>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; as Trustee</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 0 2.5in">&nbsp;</P>
<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 12pt Times New Roman, Times, Serif; width: 100%">

<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 4%">&nbsp;</TD>
    <TD STYLE="width: 6%">&nbsp;</TD>
    <TD STYLE="width: 40%">&nbsp;</TD></TR>

<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>By:</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid;">/s/ Laurence J. O&rsquo;Brien</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Name:&nbsp;&nbsp;</TD>
    <TD>Laurence J. O&rsquo;Brien</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Title:</TD>
    <TD>Vice President</TD></TR>
</TABLE>
<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 0 2.5in">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 24pt 2.5in"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0">Twentieth Supplemental Indenture</P>



<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: right">EXHIBIT&nbsp;A</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">Form of 2.950 % Senior Note due 2030</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-indent: 1in">[<I>The following legends apply only if the Note
is a Global Note</I>:</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING
OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE THEREOF. THIS NOTE MAY NOT
BE EXCHANGED IN WHOLE OR IN PART FOR A NOTE REGISTERED, AND NO TRANSFER OF THIS NOTE IN WHOLE OR IN PART MAY BE REGISTERED, IN
THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITORY OR ITS NOMINEE EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE
OF THE DEPOSITORY TRUST COMPANY TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT AND SUCH CERTIFICATE
ISSUED IN EXCHANGE FOR THIS CERTIFICATE IS REGISTERED IN THE NAME OF CEDE &amp; CO., OR SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY, ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL,
SINCE THE REGISTERED OWNER HEREOF, CEDE &amp; CO., HAS AN INTEREST HEREIN.]</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>&nbsp;</B></P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>QUEST DIAGNOSTICS INCORPORATED</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>2.950 % Senior Note due 2030</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt"><B></B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 12pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 50%"><P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"><B>No. 0 (Specimen) </B></P></TD>
    <TD STYLE="width: 50%; text-align: right"><P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"><B>$[_________]</B></P></TD></TR>
</TABLE>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt"><B>CUSIP: 74834L BB5</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Quest Diagnostics Incorporated, a Delaware
corporation (herein called the &ldquo;Company,&rdquo; which term includes any successor Person under the Indenture hereinafter
referred to), for value received, hereby promises to pay to Cede &amp; Co., or registered assigns, the principal sum of $[_________]
on June 30, 2030 (the &ldquo;Stated Maturity&rdquo;) (except to the extent redeemed or repaid prior to the Stated Maturity) and
to pay interest thereon from December 16, 2019 or from the most recent Interest Payment Date to which interest has been paid or
duly provided for semi-annually at the rate of 2.950% per annum, on June 30 and December 30, commencing with June 30, 2020, on
the Stated Maturity and on any Redemption Date (each such date, an &ldquo;Interest Payment Date&rdquo;) until the principal hereof
is paid or made available for payment. All capitalized terms used but not defined herein shall have the meanings ascribed to such
terms in the Indenture.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Payment of Interest</U>. The interest
so payable, and punctually paid or made available for payment, on any Interest Payment Date, will, as provided in the Indenture,
be paid, in immediately available funds, to the Person in whose name this Note (or one or more Predecessor Securities) is registered
at the close of business on June 15 or December 15 (whether or not a Business Day, as defined in the Indenture), as the case may
be, next preceding such Interest Payment Date (the &ldquo;Regular Record Date&rdquo;). Any such interest not punctually paid or
duly provided for (&ldquo;Defaulted Interest&rdquo;) will forthwith cease to be payable to the Holder on such Regular Record Date,
and such Defaulted Interest, may be paid to the Person in whose name this Note (or one or more Predecessor Securities) is registered
at the close of business on a special record date (the &ldquo;Special Record Date&rdquo;) for the payment of such Defaulted Interest
to be fixed by the Trustee, notice whereof shall be given to Holders of Notes not less than ten days prior to such Special Record
Date, or may be paid at any time in any other lawful manner not inconsistent with requirements of any securities exchange on which
the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Place of Payment</U>. Payment of interest
on this Note will be made at the Corporate Trust Office of the Trustee or such other office or agency of the Company as may be
designated for such purpose, in such coin or currency of the United States of America as at the time of payment is legal tender
for payment of public and private debts; <I>provided</I>, <I>however</I>, that each installment of interest and payment of principal
on this Note may at the Company&rsquo;s option be paid in immediately available funds by transfer to an account maintained by the
payee located in the United States. Payment of the principal of this Note on the Stated Maturity will be made against presentation
of this Note at the office or agency of the Company maintained for that purpose in the Borough of Manhattan, The City of New York,
in such coin or currency of the United States of America as at the time of payment is legal tender for the payment of public and
private debts.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Time of Payment</U>. In any case where
any Interest Payment Date, Redemption Date or Stated Maturity shall not be a Business Day at any Place of Payment, then (notwithstanding
any other provision of the Indenture or this Note), payment of principal or interest, if any, need not be made at such Place of
Payment on such date, but may be made on the next succeeding Business Day at such Place of Payment with the same force and effect
as if made on the Interest Payment Date, Redemption Date, or at Stated Maturity; <I>provided</I> that no interest shall accrue
on the amount so payable for the period from and after such Interest Payment Date, Redemption Date, Repayment Date, or Stated Maturity,
as the case may be.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Legends</U>. The statements set forth
in the restrictive legends above are an integral part of the terms of this Note and by acceptance hereof each Holder of this Note
agrees to be subject to and bound by the terms and provisions set forth in such legend.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>General</U>. This Note is one of a duly
authorized issue of securities (herein called the &ldquo;Securities&rdquo;) of the Company, issued and to be issued in one or more
series under an indenture, dated as of June&nbsp;27, 2001 (the &ldquo;Base Indenture&rdquo;), between the Company and The Bank
of New York, Trustee (herein called the &ldquo;Trustee,&rdquo; which term includes any successor trustee under the Indenture with
respect to a series of which this Note is a part), to which Base Indenture and all indentures supplemental thereto, including the
supplemental indenture dated December 16, 2019 (the &ldquo;Supplemental Indenture&rdquo;) (the Base Indenture, as so supplemented,
the &ldquo;Indenture&rdquo;), reference is hereby made for a statement of the respective rights, limitations of rights, duties
and immunities thereunder of the Company, the Trustee and the Holders of the Securities, and of the terms upon which the Securities
are, and are to be, authenticated and delivered. This Note is one of a duly authorized series of Securities designated as &ldquo;2.950%
Senior Notes due 2030&rdquo; (collectively, the &ldquo;Notes&rdquo;), initially limited in aggregate principal amount to $800,000,000.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Further Issuance</U>. The Company may
from time to time, without the consent of the Holders of Notes of this series, issue additional Notes (the &ldquo;Additional Notes&rdquo;)
of this series having the same ranking and the same interest rate, maturity and other terms as the Notes of this series. Any Additional
Notes of this series and the Notes of this series will constitute a single series under the Indenture and all references to the
Notes of this series shall include the Additional Notes unless the context otherwise requires.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Book-Entry</U>. This Note is a Global
Note representing $[_________] of the Notes. This Note is a &ldquo;book entry&rdquo; Note and is being registered in the name of
Cede &amp; Co. as nominee of The Depository Trust Company (the &ldquo;Depository&rdquo;), a clearing agency. Subject to the terms
of the Indenture, this Note will be held by a clearing agency or its nominee, and beneficial interest will be held by beneficial
owners through the book-entry facilities of such clearing agency or its nominee in minimum denominations of $2,000 and integral
multiples of $1,000 in excess thereof. As long as this Note is registered in the name of the Depository or its nominee, the Trustee
will make payments of principal and interest on this Note by wire transfer of immediately available funds to the Depository or
its nominee. Notwithstanding the above, the final payment on this Note will be made after due notice by the Trustee of the pendency
of such payment and only upon presentation and surrender of this Note at its Corporate Trust Office or such other offices or agencies
appointed by the Trustee for that purpose and such other locations provided in the Indenture.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Events of Default</U>. If an Event of
Default with respect to the Notes shall have occurred and be continuing, the principal of the Notes of this series may be declared
due and payable in the manner and with the effect provided in the Indenture.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Optional Redemption</U>. The Notes of
this series are not subject to any sinking fund. Prior to March 30, 2030 (three months prior to their maturity date), the Notes
of this series will be redeemable at any time, at the option of the Company, in whole or from time to time in part, upon not less
than 15 nor more than 60&nbsp;days&rsquo; prior notice, at a Redemption Price, calculated pursuant to the Indenture, together with
accrued interest thereon, if any, to, but excluding, the Redemption Date (subject to the rights of holders of record on the Regular
Record Date that is prior to the Redemption Date to receive interest on the relevant Interest Payment Date). On or after March
30, 2030 (three months prior to their maturity date), the Notes of this series will be redeemable at any time, at the option of
the Company, in whole or from time to time in part, upon not less than 15 nor more than 60 days&rsquo; prior notice, at a redemption
price equal to 100% of the principal amount of the Notes being redeemed, together with accrued interest thereon, if any, to, but
excluding, the Redemption Date (subject to the rights of holders of record on the Regular Record Date that is prior to the Redemption
Date to receive interest on the relevant Interest Payment Date). If less than all of the Notes of this series are to be redeemed,
and such Notes are at the time represented by one or more global security certificates, then the Notes to be redeemed shall be
selected in accordance with the procedures of the Depository. If less than all of the Notes of this series are to be redeemed,
and such Notes are not represented by one or more global security certificates, the Notes to be redeemed shall be selected by the
Trustee by such method as the Trustee in its sole discretion shall deem fair and appropriate. If any Note is to be redeemed in
part only, the notice of redemption relating to such Note shall state the portion of the principal amount thereof to be redeemed.
A new Note in principal amount equal to the unredeemed portion thereof will be issued in the name of the Holder thereof upon cancellation
of this Note.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Redemption upon a Change of Control
Triggering Event</U>. Upon the occurrence of a Change of Control Triggering Event, the Company shall be required to make an offer
to repurchase the Notes on the terms set forth in the Indenture.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Defeasance and Covenant Defeasance</U>.
The Indenture contains provisions for defeasance at any time of (a) the entire indebtedness of the Company on this Note and (b)
certain restrictive covenants and the related Defaults and Events of Default, upon compliance by the Company with certain conditions
set forth therein, which provisions apply to this Note.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Modification and Waivers; Obligations
of the Company Absolute</U>. The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the
modification of the rights and obligations of the Company and the rights of the Holders of the Securities of each series. Such
amendment may be effected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not
less than a majority in aggregate principal amount of the Outstanding Notes of each series affected thereby. The Indenture also
contains provisions permitting the Holders of not less than a majority in aggregate principal amount of the Securities at the time
Outstanding, on behalf of the Holders of all Outstanding Securities, to waive compliance by the Company with certain provisions
of the Indenture. Furthermore, provisions in the Indenture permit the Holders of not less than a majority in aggregate principal
amount of the Outstanding Securities of individual series to waive on behalf of all of the Holders of Securities of such individual
series certain past defaults under the Indenture and their consequences. Any such consent or waiver shall be conclusive and binding
upon the Holder of this Note and upon all future Holders of this Note and of any Note issued upon the registration of transfer
hereof or in exchange hereof or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">No reference herein to the Indenture and
no provision of this Note or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional,
to pay the principal of and interest on this Note at the time, place, and rate, and in the coin or currency, herein prescribed.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Limitation on Suits</U>. As set forth
in, and subject to, the provisions of the Indenture, no Holder of any Note of this series will have any right to institute any
proceeding with respect to the Indenture or for any remedy thereunder, unless such Holder shall have previously given to the Trustee
written notice of a continuing Event of Default with respect to this series, the Holders of not less than 25% in principal amount
of the Outstanding Notes of this series shall have made written request, and offered reasonable indemnity, to the Trustee to institute
such proceedings as trustee, and the Trustee shall not have received from the Holders of a majority in principal amount of the
Outstanding Notes of this series a direction inconsistent with such request and shall have failed to institute such proceeding
within 60 days; <I>provided</I>, <I>however</I>, that such limitations do not apply to a suit instituted by the Holder hereof for
the enforcement of payment of the principal of or interest on this Note on or after the respective due dates expressed herein.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Authorized Denominations</U>. The Notes
of this series are issuable only in registered form without coupons in denominations of $2,000 or any integral multiple of $1,000
in excess thereof.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Registration of Transfer or Exchange</U>.
As provided in the Indenture and subject to certain limitations herein and therein set forth, the transfer of this Note is registrable
in the Security Register upon surrender of this Note for registration of transfer at the office or agency of the Company in any
place where the principal of and interest on this Note are payable, duly endorsed by, or accompanied by a written instrument of
transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly
authorized in writing, and thereupon one or more new Notes, of authorized denominations and for the same aggregate principal amount,
will be issued to the designated transferee or transferees.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">As provided in the Indenture and subject
to certain limitations herein and therein set forth, the Notes are exchangeable for a like aggregate principal amount of Notes
of different authorized denominations, as requested by the Holders surrendering the same.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>This Note is a Global Security</U>.
If the Depository is at any time unwilling, unable or ineligible to continue as depository and a successor depository is not appointed
by the Company within 90 days or an Event of Default under the Indenture has occurred and is continuing, the Company will issue
Securities in certificated form in exchange for each Global Security. In addition, the Company may at any time determine not to
have Securities represented by a Global Security and, in such event, will issue Securities in certificated form in exchange in
whole for the Global Security representing such Security. In any such instance, an owner of a beneficial interest in a Global Security
will be entitled to physical delivery in certificated form of Securities equal in principal amount to such beneficial interest
and to have such Securities registered in its name. Securities so issued in certificated form will be issued in denominations of
$2,000 or any amount in excess thereof which is an integral multiple of $1,000 and will be issued in registered form only, without
coupons.</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">No service charge shall be made for any
such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other governmental
charge payable in connection therewith.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Prior to due presentment of this Note for
registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Holder as the owner
hereof for all purposes, whether or not this Note be overdue, and neither the Company, the Trustee nor any such agent shall be
affected by notice to the contrary.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><U>Defined Terms</U>. All terms used in
this Note, which are defined in the Indenture and are not otherwise defined herein, shall have the meanings assigned to them in
the Indenture.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in"><B><U>Governing Law</U>. This Note shall
be governed by and construed in accordance with the laws of the State of New York.</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">Unless the certificate of authentication
hereon has been executed by the Trustee by manual signature, this Note shall not be entitled to any benefit under the Indenture
or be valid or obligatory for any purpose.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">&nbsp;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">IN WITNESS WHEREOF, the Company has caused
this instrument to be duly executed.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt">Dated:</P>
<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 12pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">QUEST DIAGNOSTICS INCORPORATED</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 6%">&nbsp;</TD>
    <TD STYLE="width: 44%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD><FONT STYLE="font-size: 12pt">&nbsp;</TD>
    <TD>By:</TD>
    <TD STYLE="border-bottom: Black 1pt solid;">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD nowrap>Name:&nbsp;&nbsp;</TD>
    <TD>Sandip Patel</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Attest:</TD>
    <TD>Title:</TD>
    <TD>Vice President &amp; Treasurer</TD></TR>
</TABLE>
<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 24pt 2.5in"></P>
<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 12pt Times New Roman, Times, Serif; width: 100%">

<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 8%">&nbsp;</TD>
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 42%">&nbsp;</TD></TR>

<TR STYLE="vertical-align: top; text-align: left">
    <TD>By:</TD>
    <TD STYLE="border-bottom: Black 1pt solid">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="white-space: nowrap">Name:&nbsp;&nbsp;</TD>
    <TD>William J. O&rsquo;Shaughnessy, Jr.</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Title:</TD>
    <TD>Deputy General Counsel and Corporate Secretary</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">&nbsp;</P>
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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">TRUSTEE&rsquo;S CERTIFICATE OF AUTHENTICATION</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 1in">This is one of the Notes of the series
designated and referred to in the within-mentioned Indenture, as such is supplemented by the within-mentioned Twentieth Supplemental
Indenture.</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 12pt Times New Roman, Times, Serif; width: 100%">

<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">THE BANK OF NEW YORK MELLON,<BR>
as Trustee</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 4%">&nbsp;</TD>
    <TD STYLE="width: 6%">&nbsp;</TD>
    <TD STYLE="width: 40%">&nbsp;</TD></TR>

<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>By:</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid;">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Name:&nbsp;&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Title:</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 24pt 2.5in"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt">Dated:</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 24pt">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: right">&nbsp;</P>

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<P STYLE="margin: 0"></P>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>ss160605_ex0501.htm
<DESCRIPTION>OPINION OF SHEARMAN & STERLING LLP
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">
<P STYLE="margin: 0; text-align: right"><B>Exhibit 5.1</B></P>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 100%; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif"><IMG SRC="image_001.jpg" ALT="" STYLE="height: 11px; width: 248px"></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>
        <P STYLE="font: 8pt/10pt Arial, Helvetica, Sans-Serif; margin: 8pt 0 24pt; text-align: center">599 Lexington Avenue<BR>
        New York, NY 10022-6069</P>
        <P STYLE="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0 0 24pt; text-align: center">+1.<FONT STYLE="font-family: Arial, Helvetica, Sans-Serif">212.848.4000</FONT></P></TD></TR>
</TABLE>


<P STYLE="margin: 0"></P>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0"></P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0; text-align: right">December 16, 2019</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0">The Board of Directors<BR>
Quest Diagnostics Incorporated<BR>
500 Plaza Drive<BR>
Secaucus, New Jersey 07094<BR>
<BR>
</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt"><BR>
Ladies and Gentlemen:</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">We have acted as counsel to Quest Diagnostics Incorporated, a Delaware corporation
(the &ldquo;<U>Company</U>&rdquo;), in connection with (i) the purchase and sale of $800,000,000 aggregate principal amount of
the Company&rsquo;s 2.950% Senior Notes due 2030 (the &ldquo;<U>Notes</U>&rdquo;), pursuant to the Underwriting Agreement, dated
as of December 9, 2019 (the &ldquo;<U>Underwriting Agreement</U>&rdquo;), among the Company and J.P. Morgan Securities LLC, Morgan
Stanley &amp; Co. LLC and Wells Fargo Securities LLC, as representatives of the several underwriters named therein; (ii) the preparation
and filing by the Company with the Securities and Exchange Commission (the &ldquo;<U>Commission</U>&rdquo;) under the Securities
Act of 1933, as amended (the &ldquo;<U>Securities Act</U>&rdquo;), of the automatic registration statement on Form S-3 (File No.
333-232138) filed by the Company under the Securities Act with the Commission on June 14, 2019 (such automatic registration statement,
including the information deemed to be a part thereof at the time of effectiveness pursuant to Rule 430B under the Securities Act
and documents incorporated by reference therein, being hereinafter referred to as the &ldquo;<U>Registration Statement</U>&rdquo;);
(iii) the preparation and filing with the Commission of the prospectus, dated June 14, 2019, relating to the debt securities generally
contained in the Registration Statement (the prospectus, including the documents incorporated by reference therein, being hereinafter
referred to as the &ldquo;<U>Base Prospectus</U>&rdquo;), the preliminary prospectus, dated December 9, 2019, with respect to the
Notes, including the Base Prospectus, the preliminary prospectus supplement and all documents incorporated or deemed incorporated
therein by reference (in the form in which it was filed with the Commission pursuant to Rule 424(b), the &ldquo;<U>Preliminary
Prospectus</U>&rdquo;), the pricing term sheet, dated December 9, 2019, relating to the Notes, in the form filed with the Commission
pursuant to Rule 433 under the Securities Act (the &ldquo;<U>Pricing Term Sheet</U>&rdquo;), and the final prospectus, dated December
9, 2019, with respect to the Notes, including the Base Prospectus, the final prospectus supplement and all documents incorporated
or deemed incorporated therein by reference (in the form in which it was filed with the Commission pursuant to Rule 424(b) under
the Securities Act, the &ldquo;<U>Final Prospectus</U>&rdquo;).</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 100%; font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9.5pt"><B>SHEARMAN.COM</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font: 12pt/8pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 6pt">Shearman &amp; Sterling LLP is a limited liability partnership organized in the United States under the laws of the state of Delaware, which laws limit the personal liability of partners. </FONT></TD></TR>
</TABLE>


<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt"></P>
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<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">The Notes have been issued in one or more series pursuant to an indenture,
dated as of June 27, 2001 (the &ldquo;<U>Base Indenture</U>&rdquo;), among the Company, the Subsidiary Guarantors (as defined therein)
and The Bank of New York Mellon (formerly, &ldquo;The Bank of New York&rdquo;), as trustee (the &ldquo;<U>Trustee</U>&rdquo;),
as supplemented by a first supplemental indenture, dated as of June 27, 2001, among the Company, the Initial Subsidiary Guarantors
(as defined therein) and the Trustee, as further supplemented by a second supplemental indenture, dated as of November 26, 2001,
among the Company, the Subsidiary Guarantors (as defined therein) and the Trustee, as further supplemented by a third supplemental
indenture, dated as of April 4, 2002, among the Company, the Additional Subsidiary Guarantors (as defined therein) and the Trustee,
as further supplemented by a fourth supplemental indenture, dated as of March&nbsp;19, 2003, among the Company, the Additional
Subsidiary Guarantor (as defined therein) and the Trustee, as further supplemented by a fifth supplemental indenture, dated as
of April 16, 2004, among the Company, the Additional Subsidiary Guarantor (as defined therein) and the Trustee, as further supplemented
by a sixth supplemental indenture, dated as of October 31, 2005, among the Company, the Subsidiary Guarantors (as defined therein)
and the Trustee, as further supplemented by a seventh supplemental indenture, dated as of November 21, 2005, among the Company,
the Additional Subsidiary Guarantors (as defined therein) and the Trustee, as further supplemented by an eighth supplemental indenture,
dated as of July 31, 2006, among the Company, the Additional Subsidiary Guarantors (as defined therein) and the Trustee, as further
supplemented by a ninth supplemental indenture, dated as of September&nbsp;30, 2006, among the Company, the Additional Subsidiary
Guarantors (as defined therein) and the Trustee, as further supplemented by a tenth supplemental indenture, dated as of June 22,
2007, among the Company, the Subsidiary Guarantors (as defined therein) and the Trustee, as further supplemented by an eleventh
supplemental indenture, dated as of June 22, 2007, among the Company, the Additional Subsidiary Guarantors (as defined therein)
and the Trustee, as further supplemented by a twelfth supplemental indenture, dated as of June 25, 2007, among the Company, the
Additional Subsidiary Guarantors (as defined therein) and the Trustee, as further supplemented by a thirteenth supplemental indenture,
dated as of November 17, 2009, among the Company, the Subsidiary Guarantors (as defined therein) and the Trustee, as further supplemented
by a fourteenth supplemental indenture, dated as of March 24, 2011, among the Company, the Subsidiary Guarantors (as defined therein)
and the Trustee, as further supplemented by a fifteenth supplemental indenture, dated as of November 30, 2011, among the Company,
the Additional Subsidiary Guarantors (as defined therein) and the Trustee, as further supplemented by a sixteenth supplemental
indenture, dated as of March 17, 2014, between the Company and the Trustee, as further supplemented by a seventeenth supplemental
indenture, dated as of March 10, 2015, between the Company and the Trustee, as further supplemented by an eighteenth supplemental
indenture, dated as of May 26, 2016, between the Company and the Trustee, as further supplemented by a nineteenth supplemental
indenture, dated as of March 12, 2019, between the Company and the Trustee, and as further supplemented by a twentieth supplemental
indenture, dated as of December 16, 2019, between the Company and the Trustee (collectively, as so supplemented, the &ldquo;<U>Indenture</U>&rdquo;).</P>
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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">In that connection, we have reviewed originals or copies of the following
documents:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 72pt"></TD><TD STYLE="width: 19.5pt">(a)</TD><TD>The Indenture (including the supplemental indentures referred to above); and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 72pt"></TD><TD STYLE="width: 19.5pt">(b)</TD><TD>The Notes in global form as executed by the Company.</TD></TR></TABLE>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">The documents described in the foregoing clauses (a) and (b) of this paragraph
are collectively referred to herein as the &ldquo;<U>Opinion Documents</U>.&rdquo;</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">We have also reviewed the following:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">(a)</TD><TD>The Registration Statement.</TD></TR></TABLE>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Base Prospectus.</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Preliminary Prospectus.</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Pricing Term Sheet.</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(e)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Final Prospectus.</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">(f)</TD><TD>Originals or copies of such other corporate records of the Company, certificates of public officials and of officers of the
Company and agreements and other documents as we have deemed necessary as a basis for the opinions expressed below.</TD></TR></TABLE>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">In our review of the Opinion Documents and other documents, we have assumed:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">(a)</TD><TD>The genuineness of all signatures.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">(b)</TD><TD>The authenticity of the originals of the documents submitted to us.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">(c)</TD><TD>The conformity to authentic originals of any documents submitted to us as copies.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">(d)</TD><TD>As to matters of fact, the truthfulness of the representations made in the Opinion Documents and in certificates of public
officials and officers of the Company.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">(e)</TD><TD>That each of the Opinion Documents is the legal, valid and binding obligation of each party thereto, other than the Company,
and is enforceable against each such party, other than the Company, in accordance with its terms.</TD></TR></TABLE>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt 0.5in; text-indent: 0.5in">(f)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;That:</P>
<!-- Field: Page; Sequence: 3 -->
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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1.5in"></TD><TD STYLE="width: 0.5in">(i)</TD><TD>The Company is duly organized and validly existing under the laws of the jurisdiction of its organization.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1.5in"></TD><TD STYLE="width: 0.5in">(ii)</TD><TD>The Company has the full power to execute, deliver and perform, and the Company has duly executed and delivered (except to
the extent Generally Applicable Law is applicable to such execution and delivery), the Opinion Documents.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1.5in"></TD><TD STYLE="width: 0.5in">(iii)</TD><TD>The execution, delivery and performance by the Company of the Opinion Documents to which it is a party do not and will not:</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 2in"></TD><TD STYLE="width: 0.5in">(a)</TD><TD>contravene its certificate or articles of incorporation, by-laws or other organizational documents; or</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 2in"></TD><TD STYLE="width: 0.5in">(b)</TD><TD>except with respect to Generally Applicable Law, violate any law, rule or regulation applicable to it.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">(g)</TD><TD>That the execution, delivery and performance by the Company of the Opinion Documents to which it is a party do not and will
not result in any conflict with or breach of any agreement or document binding on it.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">(h)</TD><TD>Except with respect to Generally Applicable Law, no authorization, approval, consent or other action by, and no notice to or
filing with, any governmental authority or regulatory body or any other third party is required for the due execution, delivery
or performance by the Company of any Opinion Document or, if any such authorization, approval, consent, action, notice or filing
is required, it has been duly obtained, taken, given or made and is in full force and effect.</TD></TR></TABLE>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">We have not independently established the validity of the foregoing assumptions.</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">&ldquo;<U>Generally Applicable Law</U>&rdquo; means the federal law of the
United States of America, and the law of the State of New York (including in each case the rules or regulations promulgated thereunder
or pursuant thereto), that a New York lawyer exercising customary professional diligence would reasonably be expected to recognize
as being applicable to the Company, the Opinion Documents or the transactions governed by the Opinion Documents, and for purposes
of assumption paragraphs (f) and (h) above and our opinions below, the General Corporation Law of the State of Delaware. Without
limiting the generality of the foregoing definition of Generally Applicable Law, the term &ldquo;Generally Applicable Law&rdquo;
does not include any law, rule or regulation that is applicable to the Company, the Opinion Documents or such transactions solely
because such law, rule or regulation is part of a regulatory regime applicable to the specific assets or business of any party
to any of the Opinion Documents or any of its affiliates.</P>
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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">Based upon the foregoing and upon such other investigation as we have deemed
necessary and subject to the qualifications set forth below, we are of the opinion that:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">1.</TD><TD>The Indenture is the legal, valid and binding obligation of the Company, enforceable against the Company in accordance with
its terms.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.5in">2.</TD><TD>The Notes, when authenticated by the Trustee in accordance with the Indenture and delivered and paid for as provided in the
Underwriting Agreement, will be the legal, valid and binding obligations of the Company, enforceable against the Company in accordance
with their terms and entitled to the benefits of the Indenture.</TD></TR></TABLE>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">Our opinions expressed above are subject to the following qualifications:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.25in">(a)</TD><TD>Our opinions are subject to the effect of any applicable bankruptcy, insolvency, reorganization, moratorium or similar laws
affecting creditors&rsquo; rights generally (including without limitation all laws relating to fraudulent transfers).</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.25in">(b)</TD><TD>Our opinions are also subject to the effect of general principles of equity, including without limitation concepts of materiality,
reasonableness, good faith and fair dealing (regardless of whether considered in a proceeding in equity or at law).</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 12pt Proxima Nova A; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 1in"></TD><TD STYLE="width: 0.25in">(c)</TD><TD>Our opinions are limited to Generally Applicable Law, and we do not express any opinion herein concerning any other law.</TD></TR></TABLE>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">This opinion letter speaks only as of the date hereof. We expressly disclaim
any responsibility to advise you of any development or circumstance of any kind, including any change of law or fact, that may
occur after the date of this opinion letter and which might affect the opinions expressed herein.</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">We hereby consent to the filing of this opinion letter as an exhibit to
your Current Report on Form 8-K, dated December 16, 2019, and incorporated by reference into the Registration Statement and to
the use of our name under the heading &ldquo;Legal Matters&rdquo; in the prospectus constituting a part of such Registration Statement.
In giving this consent, we do not hereby admit that we are in the category of persons whose consent is required under Section 7
of the Securities Act or the rules and regulations of the Commission promulgated thereunder.</P>
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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">Very truly yours,</P>

<P STYLE="font: 10pt Proxima Nova A; margin: 0 0 12pt">&nbsp;</P>

<P STYLE="font: 10pt Proxima Nova A; margin: 0 0 12pt">&nbsp;</P>

<P STYLE="font: 10pt Proxima Nova A; margin: 0 0 12pt">&nbsp;</P>

<P STYLE="font: 10pt Proxima Nova A; margin: 0 0 12pt"></P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0">/s/ Shearman &amp; Sterling LLP</P>


<P STYLE="font: 10pt Proxima Nova A; margin: 0 0 12pt"></P>

<P STYLE="font: 10pt Proxima Nova A; margin: 0 0 12pt">&nbsp;</P>

<P STYLE="font: 10pt Proxima Nova A; margin: 0">LN/dy/nk/mp</P>

<P STYLE="font: 10pt Proxima Nova A; margin: 0 0 12pt">STG</P>

<P STYLE="font: 12pt Proxima Nova A; margin: 0 0 12pt">&nbsp;</P>

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end
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<DOCUMENT>
<TYPE>EX-101.SCH
<SEQUENCE>5
<FILENAME>dgx-20191216.xsd
<DESCRIPTION>XBRL SCHEMA FILE
<TEXT>
<XBRL>
<?xml version="1.0" encoding="US-ASCII" ?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 5.1d -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: http://www.novaworks.co -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
    <!-- Field: Doc-Info; Name: Misc; Value: +qs5w7xRiXgOn8uGaH9cOaWEGaPtzJJ9OZkhsmd4bYnqryUkkAsQCyt3E8/GYUoN -->
<schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:dei="http://xbrl.sec.gov/dei/2019-01-31" xmlns:us-gaap="http://fasb.org/us-gaap/2019-01-31" xmlns:srt="http://fasb.org/srt/2019-01-31" xmlns:srt-types="http://fasb.org/srt-types/2019-01-31" xmlns:DGX="http://DGX/20191216" elementFormDefault="qualified" targetNamespace="http://DGX/20191216">
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	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
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    <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
    <import namespace="http://xbrl.sec.gov/dei/2019-01-31" schemaLocation="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd" />
    <import namespace="http://fasb.org/us-gaap/2019-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd" />
    <import namespace="http://fasb.org/us-types/2019-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2019/elts/us-types-2019-01-31.xsd" />
    <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
    <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
    <import namespace="http://xbrl.sec.gov/country/2017-01-31" schemaLocation="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd" />
    <import namespace="http://fasb.org/srt/2019-01-31" schemaLocation="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd" />
    <import namespace="http://fasb.org/srt-types/2019-01-31" schemaLocation="http://xbrl.fasb.org/srt/2019/elts/srt-types-2019-01-31.xsd" />
</schema>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>6
<FILENAME>dgx-20191216_lab.xml
<DESCRIPTION>XBRL LABEL FILE
<TEXT>
<XBRL>
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<span style="display: none;">v3.19.3.a.u2</span><table class="report" border="0" cellspacing="2" id="idp6614749440">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Cover<br></strong></div></th>
<th class="th"><div>Dec. 16, 2019</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">8-K<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Dec. 16,  2019<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityFileNumber', window );">Entity File Number</a></td>
<td class="text">001-12215<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">Quest Diagnostics Incorporated<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001022079<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity Tax Identification Number</a></td>
<td class="text">16-1387862<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">DE<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity Address, Address Line One</a></td>
<td class="text">500 Plaza Drive<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">Secaucus<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">NJ<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">07094<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">(973)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">520-2700<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_WrittenCommunications', window );">Written Communications</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SolicitingMaterial', window );">Soliciting Material</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementTenderOffer', window );">Pre-commencement Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementIssuerTenderOffer', window );">Pre-commencement Issuer Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common Stock, $0.01 Par Value<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">DGX<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_AmendmentFlag</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CityAreaCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CoverAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Cover page.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CoverAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
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<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementIssuerTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 13e<br> -Subsection 4c<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementIssuerTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14d<br> -Subsection 2b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SolicitingMaterial">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Section 14a<br> -Number 240<br> -Subsection 12<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SolicitingMaterial</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:tradingSymbolItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_WrittenCommunications">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br> -Section 425<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_WrittenCommunications</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
