Exhibit-23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form S-3 (No. 333-167603) and Form S-8 (Nos. 333-143889, 333-136196, 333-136195, 333-103555, 333-60758, 333-85713, 333-74103, 333-66177, 333-60477, 333-17077, 333-17079, 333-17083, 333-157447, 333-162710 and 333-162711) of Quest Diagnostics Incorporated of our report dated February 16, 2011 relating to the financial statements, financial statement scheduleand the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP
Florham Park, New Jersey
February 16, 2011