Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated February 17, 2009 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in the 2008 Annual Report to Shareholders, which is incorporated by reference in Quest Diagnostics Incorporated Annual Report on Form 10-K for the year ended December 31, 2008.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Florham Park, New Jersey

February 18, 2009