UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                     FORM 15

             Certification and Notice of Termination of Registration
                 Under Section 12(g) of the Securities Exchange
             Act of 1934 or Suspension of Duty to File Reports Under
        Sections 13 and 15(d) of the Securities and Exchange Act of 1934

                         Commission File Number 0-22758

                               Unilab Corporation
             (Exact name of registrant as specified in its charter)

                               18448 Oxnard Street
                            Tarzana, California 91356
                                 (818) 996-7300
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

             Common Stock, par value $0.01 per share (Title of each
                    class of securities covered by this Form)

                                      N/A
   (Title of all other classes of securities for which a duty to file reports
                     under Section 13(a) or 15(d) remains)

             Please place an X in the box(es) to designate the appropriate rule
provision(s) relied upon to terminate or suspend the duty to file reports:

Rule 12g-4(a)(1)(i)           [x]              Rule 12h-3(b)(1)(i)           [ ]
Rule 12g-4(a)(1)(ii)          [ ]              Rule 12h-3(b)(1)(ii)          [ ]
Rule 12g-4(a)(2)(i)           [ ]              Rule 12h-3(b)(2)(i)           [ ]
Rule 12g-4(a)(2)(ii)          [ ]              Rule 12h-3(b)(2)(ii)          [ ]
                                               Rule 15d-6                    [ ]

             Approximate number of holders of record as of the certification or
notice date:  1

             Pursuant to the requirements of the Securities Exchange Act of
1934, Unilab Corporation has caused this certification/notice to be signed on
its behalf by the undersigned duly authorized person.

March 28, 2003                              By:    /s/ David W. Gee
                                               ---------------------------------
                                                Name:  David W. Gee
                                                Title: Executive Vice President,
                                                       Secretary and General
                                                       Counsel

Instruction: This form is required by Rules 12g-4, 12h-3 and 15d-6 of the
General Rules and Regulations under the Securities Exchange Act of 1934. The
registrant shall file with the Commission three copies of Form 15, one of which
shall be manually signed. It may be signed by an officer of the registrant, by
counsel or by any other duly authorized person. The name and title of the person
signing the form shall be typed or printed under the signature.