As filed with the Securities and Exchange Commission on March 6, 2003. Registration No. 333-103555 ================================================================================ SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ______________ POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ______________ Quest Diagnostics Incorporated (Exact name of Registrant as specified in its charter) Delaware 16-1387862 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification Number) One Malcolm Avenue Teterboro, New Jersey 07608 (Address of principal executive offices) AMENDED AND RESTATED UNILAB CORPORATION 2000 EXECUTIVE STOCK OPTION PLAN UNILAB CORPORATION 2001 STOCK OPTION PLAN (Full title of the plan) Leo C. Farrenkopf, Jr. Vice President & Secretary Quest Diagnostics Incorporated One Malcolm Avenue Teterboro, NJ 07608 (201) 393 - 5143 (Name, address and telephone number of agent for service) ================================================================================ EXPLANATORY STATEMENT Quest Diagnostics Incorporated is filing this post-effective Amendment No. 1 to its Registration Statement on Form S-8, File No. 333-103555, covering 191,933 of its common shares that may be offered pursuant to the Amended and Restated Unilab Corporation 2000 Executive Stock Option Plan (the "Plan") in order to include as Exhibit 4.12 the definitive Plan document. PART II SIGNATURES Pursuant to the requirements of the Securities Act, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this post-effective Amendment No. 1 to its Registration Statement on Form S-8 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Teterboro, State of New Jersey, on the 6th day of March, 2003. Quest Diagnostics Incorporated By: /s/ Leo C. Farrenkopf, Jr. ----------------------------------- Name: Leo C. Farrenkopf, Jr., Esq. Title: Vice President and Deputy General Counsel Pursuant to the requirements of the Securities Act, this post-effective Amendment No. 1 has been signed below by the following persons in the indicated capacities on the 6th day of March, 2003. Signature Capacity --------- -------- * Chairman of the Board and Chief Executive ---------------------- Officer and Director (principal executive officer) Kenneth W. Freeman * Corporate Vice President and Chief Financial ---------------------- Officer (principal financial officer) Robert A. Hagemann * Vice President, Corporate Controller and ---------------------- Chief Accounting Officer (chief accounting officer) Thomas F. Bongiorno * Director ---------------------- Kenneth D. Brody * Director ---------------------- William F. Buehler * Director ---------------------- Van C. Campbell * Director ---------------------- Mary A. Cirillo * Director ---------------------- William R. Grant * Director ---------------------- Rosanne Haggerty * Director ---------------------- Dan C. Stanzione * Director ---------------------- Gail R. Wilensky * Director ---------------------- John B. Ziegler * By /s/ Leo C. Farrenkopf, Jr. ---------------------------------- Leo C. Farrenkopf, Jr., Esq. Attorney-in-Fact EXHIBIT INDEX Exhibit No. Description of Document 4.12 Amended and Restated Unilab Corporation 2000 Executive Stock Option Plan