<PAGE>
                                                                    Exhibit 23.2


INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Registration Statement of
Quest Diagnostics Incorporated on Form S-4 of our reports dated February 1,
2002, appearing in the Annual Report on Form 10-K of Unilab Corporation for the
years ended December 31, 2001 and 2000 and to the reference to us under the
heading "Experts" in the Prospectus, which is part of this Registration
Statement.



/s/ DELOITTE & TOUCHE LLP

DELOITTE & TOUCHE LLP
Los Angeles, California

May 13, 2002




