Quest Diagnostics Careers

A diagnostic information services company supporting patients, clinicians and healthcare organisations.

questdiagnostics.com

About the company

Founded

1967

Headquarters

Secaucus, New Jersey

Listed on

NYSE: DGX

Employees

Nearly 57,000

Revenue (FY2025)

$11.04 billion

Reported diluted EPS (FY2025)

$8.75

Operating cash flow (FY2025)

$1.89 billion

US adult reach

Serves 1 in 3 adults annually

Provider reach

Serves half of US physicians and hospitals

Test menu

More than 3,500 routine and specialty tests

Quest Diagnostics was founded in 1967 and is headquartered in Secaucus, New Jersey. It provides diagnostic information services through laboratory testing, data and clinical insights.

The company says it serves one in three adult Americans and half of US physicians and hospitals. Its menu includes more than 3,500 routine and specialty tests.

Quest reported $11.04 billion in revenue for 2025 and nearly 57,000 employees. Its international operations include a Global Information Center in Hyderabad, India.

Key People

James E. Davis

Chairman, Chief Executive Officer and President

Sam Samad

Executive Vice President and Chief Financial Officer

Cecilia McKenney

Senior Vice President and Chief Human Resources Officer

Catherine T. Doherty

Executive Vice President, Regional Businesses

Interview process at Quest Diagnostics

(1,743 candidate-reported interview experiences on Indeed)

Interview experience

Favorable, rated 7 out of 10

Interview difficulty

Easy, rated 4 out of 10

Interview process length

About two weeks

Overall experience

PoorExcellent

EasyDifficult

Interview process length

About a day or two27%

About a week29%

About a month13%

More than one month10%

Prep for your Quest Diagnostics interview with AI

Practise patient service, laboratory operations and workplace scenarios with structured feedback.

Quest Diagnostics Interview Questions & Answers

Q: Tell me about a time you set a challenging goal and how you achieved it.

A: Use a specific goal, explain the plan and obstacles, then quantify the outcome and what you learned.

Answer by AI

Define why the goal was difficult.
Show the actions you owned.
Measure the result.

Q: Tell me about a time when following rules was essential.

A: Choose a safety, privacy or quality example and explain how you followed the procedure while keeping work moving.

Answer by AI

Name the rule or standard.
Explain the risk it controlled.
Show the verified outcome.

Q: How do you handle stressful situations?

A: Describe how you prioritize, communicate and check critical details, then support it with one recent example.

Answer by AI

Use a real situation.
Explain your decision order.
Show calm communication.

Q: Tell me about a conflict with an employee and how you handled it.

A: Focus on listening, separating facts from assumptions and agreeing on a practical next step while preserving the working relationship.

Answer by AI

Keep the tone professional.
Show direct communication.
End with the outcome.

Prep for your Quest Diagnostics interview with AI

Practise patient service, laboratory operations and workplace scenarios with structured feedback.

Quest Diagnostics Salaries in the United States (Updated 2026)

Medical Assistant

Indeed hourly average

$22.62 per hour average

253 Salaries submitted

Wellness Nurse

Indeed hourly average

$26.12 per hour average

199 Salaries submitted

Director

Indeed annual average

$170,031 per year average

10 Salaries submitted

Phlebotomist

Indeed hourly average

$19.50 per hour average

74 Salaries submitted

Medical Technologist

Indeed hourly average

$29.24 per hour average

14 Salaries submitted

Specimen Processor

Indeed hourly average

$19.90 per hour average

51 Salaries submitted