Exhibit 23.4


                       CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the incorporation by reference in this Amendment No. 1 to
the 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.




PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania
July 11, 2001