X0306 4 2013-03-05 0001022079 QUEST DIAGNOSTICS INC DGX 0001520897 Doherty Catherine T. C/O QUEST DIAGNOSTICS INCORPORATED 3 GIRALDA FARMS MADISON NJ 07940 1 SVP, Clinical Franchises Common Stock 2013-03-05 4 A 0 2505 0 A 73080 D Common Stock 2013-03-05 4 F 0 934 56.345 D 72146 D Common Stock 3471 I 401(k)/SDCP Stock issued by Quest Diagnostics Incorporated in settlement of a performance share award dated February 10, 2010, approved in accordance with the requirements of Rule 16b-3(d). Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the settlement of said performance share award. The amount includes exempt purchases made under the Company's stock purchase plan. These underlying shares were acquired on a periodic basis by the trustee of the Company's tax qualified Profit Sharing (401(k)) and/or Supplemental Deferred Compensation Plan. The information was obtained from the plan administrator as of a current date. The number of shares is based on the account balance of the Company stock fund under each Plan (which includes some money market instruments) divided by the market price of the Company's stock as of that date. /s/ William J. O'Shaughnessy, Jr., Attorney in Fact for Catherine T. Doherty 2013-03-07