Amendment No. 1 to The Profit Sharing Plan of Quest Diagnostics Incorporated, effective as of January 1, 2018

The Profit Sharing Plan of Quest Diagnostics Incorporated, as presently maintained under an amendment and restatement effective as of January 1, 2016 (the “Plan”) is hereby amended in the following respects, effective as of January 1, 2018:

“Deferral Compensation - An Employee’s wages as defined in Code Section 3401(a) and all other payments of compensation to an Employee by an Employer (in the course of the Employer’s trade or business) for which the Employer is required to furnish the Employee a written statement under Code Sections 6041(d), 6051(a)(3) and 6052, excluding reimbursements or other expense allowances, service awards, RecognitionQuest awards, cash and non-cash fringe benefits (e.g., employee discounts), moving expenses, deferred compensation, and welfare benefits, but including Employee Pre-Tax Contributions to this Plan, pre-tax employee contributions to a Code Section 125 plan and pre-tax employee contributions to purchase qualified transportation fringe benefits pursuant to Code Section 132(f)(4).”

As evidence of its adoption of this Amendment, Quest Diagnostics Incorporated has caused this Amendment to be executed by its Chief Human Resources Officer on this 20th day of December 2017.

By: /s/ Jeffrey S. Shuman                    

Title: SVP and Chief Human Resources Officer    

The Plan allows Employers other than Quest Diagnostics to adopt its provisions. The names (and jurisdictions of organization) of Quest Diagnostics and the other Employers, as of January 1, 2018, in the Plan are: