Exhibit 23.4

                       CONSENT OF INDEPENDENT ACCOUNTANTS
                       ----------------------------------

We hereby consent to the incorporation by reference in this Registration
Statement on Form S-3 of Quest Diagnostics Incorporated of our report dated
March 15, 1999, except as to the last paragraph under the heading Basis of
Presentation in Note 1 and the second paragraph of Note 12, for which the date
is October 11, 2000, relating to the financial statements of SmithKline Beecham
Clinical Laboratories, Inc. and Certain Related Affiliates, which report appears
in Quest Diagnostics Incorporated's Current Report on Form 8-K dated October 11,
2000. We also consent to the reference to us under the heading "Experts" in such
Registration Statement.



/s/ PricewaterhouseCoopers LLP
------------------------------
PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania
November 27, 2001