Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-232138) and Form S-8 (Nos. 333-184580, 333-182863, 333-143889, 333-136196, 333-60758, 333-60477, 333-157447, 333-162710, 333-162711, 333-207746, 333-214215, 333-221076 and 333-234328) of Quest Diagnostics Incorporated of our report dated February 20, 2020 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

By	/s/ PricewaterhouseCoopers LLP
	PricewaterhouseCoopers LLP
	Florham Park, New Jersey
	February 20, 2020