POWER OF ATTORNEY


	Know all by these presents, that the undersigned
hereby constitutes and appoints each of Sirisha Gummaregula,
Michael E. Prevoznik, and Leo C. Farrenkopf, Jr., signing
singly, the undersigned's true and lawful attorney-in-
fact to:

(1)	execute for and on behalf of the undersigned,
in the undersigned's capacity as an executive officer
and/or director of Quest Diagnostics Incorporated
(the "Company"), Form ID Applications and Forms 3, 4
and 5 in accordance with Section 16(a) of the Securities
Exchange Act of 1934 and the rules thereunder;

(2)	do and perform any and all acts for and on
behalf of the undersigned which may be necessary or
desirable to complete and execute any such Form ID
Application, Form 3, 4 or 5, complete and execute any
amendment or amendments thereto, and timely  file such
form with the United States Securities and Exchange
Commission and any other authority; and

(3)	take any other action of any type whatsoever
in connection with the foregoing which, in the opinion
of such attorney-in-fact, may be of benefit to, in the
best interest of, or legally required by, the undersigned,
it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant
to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-fact's discretion.

	The undersigned hereby grants to each such attorney-
in-fact full power and authority to do and perform all and
every act and thing whatsoever requisite, necessary and
proper to be done in the exercise of any of the rights and
powers herein granted, as fully to all intents and purposes
as the undersigned might or could do if personally present,
with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-fact,
or such attorney-in-fact's substitute or substitutes,
shall lawfully do or cause to be done by virtue of this
power of attorney and the rights and powers herein granted.
The undersigned acknowledges that the foregoing attorneys-
in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the company assuming,
any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

	This Power of Attorney shall remain in full force
and effect until the undersigned is no longer required to
file Forms 3, 4, and 5 with respect to the undersigned's
holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a
signed writing delivered to the foregoing attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused
this Power of Attorney to be executed as of this 19th
day of  April, 2004.


	/s/Rosanne Haggerty
	Signature
	ROSANNE HAGGERTY



STATE OF NEW YORK	)
			):  ss.
COUNTY OF  NEW YORK	)

	On this 19th day of April, 2004, before me, the
subscriber, personally appeared ROSANNE HAGGERTY, to me
and known to me to be the same person described in and
who executed the foregoing instrument, and she duly
acknowledged to me that she executed the same.


	/s/Judith Rosenfeld
	Notary Public
	Notary Public, State of New York
	No. 01R06104346
	Qualified in Kings County
	My Commission Expires Jan 20, 2008

