<SUBMISSION>
<ACCESSION-NUMBER>0000950117-06-002337
<TYPE>8-K
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20060515
<ITEMS>8.01
<FILING-DATE>20060519
<DATE-OF-FILING-DATE-CHANGE>20060519
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>QUEST DIAGNOSTICS INC
<CIK>0001022079
<ASSIGNED-SIC>8071
<IRS-NUMBER>161387862
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>8-K
<ACT>34
<FILE-NUMBER>001-12215
<FILM-NUMBER>06855783
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>ONE MALCOLM AVE
<CITY>TETERBORO
<STATE>NJ
<ZIP>07608
<PHONE>2013935000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>ONE MALCOLM AVE
<CITY>TETERBORO
<STATE>NJ
<ZIP>07601
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>CORNING CLINICAL LABORATORIES INC
<DATE-CHANGED>19960903
</FORMER-COMPANY>
</FILER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>a42070.htm
<DESCRIPTION>QUEST DIAGNOSTICS INCORPORATED
<TEXT>
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<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font SIZE=2>UNITED STATES </font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font SIZE=2>SECURITIES AND EXCHANGE COMMISSION</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font SIZE=2>WASHINGTON, D.C.  20549</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;border-bottom:solid 0.75pt;padding-bottom:1;padding-top:0;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'>&nbsp;</p>
<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><B><font SIZE=2>FORM
  8-K</font></B></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><B><font SIZE=2>CURRENT REPORT </font></B></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><b><font size=2>PURSUANT TO SECTION 13 OR 15(d) OF </font></b></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><B><font SIZE=2>THE SECURITIES EXCHANGE ACT OF 1934</font></B></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>Date of Report (Date of Earliest Event Reported): May 15, 2006</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><b><font size=2>Quest Diagnostics Incorporated</font></b></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>1290 Wall Street West</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>Lyndhurst, NJ  07071</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>(201) 393-5000</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><b><font size=2>001-12215</font></b></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>(Commission file number)</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><b><font size=2>Delaware</font></b></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>(State of Incorporation)</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><b><font size=2>16-1387862</font></b></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>(I.R.S. Employer Identification Number)</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>
<hr align="center" width="100%" noshade>

<p style='page-break-before:always'></p>
<pAGE>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="100%" style='border-collapse:collapse'>
    <tr >
        <td width="96" valign=top >
            <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><b><font size=2>Item 8.01</font></b></p> </td>
        <td  valign=top >
            <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><b><font size=2>Other Events</font></b></p> </td> </tr></table>


<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt; text-indent:0.55in;text-align:left;'><font size=2>Quest
  Diagnostics Incorporated has received a subpoena from the California Attorney
  General&#146;s Office. The subpoena seeks various documents including documents
  relating to billings to MediCal, the California Medicaid program. The subpoena
  seeks documents from various time frames ranging from three to ten years. Quest
  Diagnostics will cooperate with the California Attorney General&#146;s Office
  in responding to the subpoena. </font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:right;'><font size=2>2</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>&nbsp;</p>
<hr align="center" width="100%" noshade>

<p style='page-break-before:always'></p>
<pAGE>
<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>
<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>&nbsp;</p>
<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:center;'>
<b><font size=2>Signatures</font></b></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt; text-indent:0.56in;text-align:left;'><font size=2>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.</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td width="58%">&nbsp;</td>
    <td colspan="2"><font size=2>May 19, 2006</font></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td colspan="2">&nbsp;</td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td colspan="2"><font SIZE=2>QUEST DIAGNOSTICS INCORPORATED</font></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td colspan="2"><font size=2>By:__</font><u><font size=2>/s/ Leo C. Farrenkopf,
      Jr.</font></u><font size=2>___________</font></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td width="3%">&nbsp;</td>
    <td width="39%"><p><font size=2>Leo C. Farrenkopf, Jr.<br>
        Assistant General Counsel and Assistant<br>
        Secretary</font></p></td>
  </tr>
</table>

<p style=' margin-bottom:0pt; margin-top:0pt; text-indent:2.75in;text-align:left;'>&nbsp;</p>

<p style=' margin-bottom:0pt; margin-top:0pt; text-indent:2.75in;text-align:left;'>&nbsp;</p>

<p style=' margin-bottom:0pt; margin-top:0pt; text-indent:2.75in;text-align:left;'>&nbsp;</p>

<p style=' margin-bottom:0pt; margin-top:0pt; text-indent:2.75in;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt; margin-left:0.05in;text-align:left;'>&nbsp;</p>

<p style=' margin-bottom:6pt; margin-top:0pt;text-align:center;'><font size=3>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:right;'><font size=2>3</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=1>&nbsp;</font></p>


<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>
<hr align="center" width="100%" noshade>
<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>



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