How many employees work at Quest Diagnostics?

Quest Diagnostics, Inc. has 37,545 employees, according to Revelio Labs workforce intelligence data. The YoY growth rate is 0.0%.

Data source: Revelio Labs Coverage: Global workforce Latest update: September 2025

About Quest Diagnostics

Quest Diagnostics (NYSE: DGX) empowers people to take action to improve health outcomes. Derived from the world's largest database of clinical lab results, our diagnostic insights reveal new avenues to identify and treat disease, inspire healthy behaviors and improve health care management. Quest annually serves one in three adult Americans and half the physicians and hospitals in the United States, and our 47,000 employees understand that, in the right hands and with the right context, our diagnostic insights can inspire actions that transform lives. The company offers physicians the broadest test menu (3,000+ tests), is a pioneer in developing innovative new tests, is the leader in cancer diagnostics, provides anatomic pathology (AP) services, & interpretive consultation through its medical & scientific staff of about 900 M.D.s & Ph.D.s. The company reported 2020 revenues of $9.44 billion. Quest Diagnostics offers the most extensive clinical testing network in the U.S., with laboratories in most major metropolitan areas, & in Mexico, the UK & India. The company also operates four esoteric laboratories, 40 outpatient AP laboratories, & 160 smaller, rapid-response laboratories. Patients may have specimens collected in any of the company’s approximately 2,250 patient service centers. On a typical workday, testing is performed for about 550,000 patients. Quest Diagnostics empowers healthcare organizations & clinicians with state-of-the-art connectivity solutions. The company is the leading provider of pre-employment drugs-of-abuse screening for employers & risk assessment services for the life insurance industry. It is the world’s 2nd largest provider of clinical trials testing for new pharmaceuticals. More information is available at www.questdiagnostics.com. Language Assistance / Non-Discrimination Notice Asistencia de Idiomas / Aviso de no Discriminación 語言協助 / 不歧視通知 www.QuestDiagnostics.com/home/nondiscrimination

As of September 2025

Quest Diagnostics
workforce metrics

Headcount

37.5k

Avg. Salary

$68.6k

Tenure

6.5yr

Growth Rate

0.0%

Hiring Rate

Attrition Rate

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Employee Headcount

Interactive chart of Quest Diagnostics annual worldwide employee count from 2023 to 2025.

  • Quest Diagnostics total number of employees in 2025 was 37,412.994, a 0% no change from 2024.
  • Quest Diagnostics total number of employees in 2024 was 37,014.415, a 0.3% decline from 2023.
  • Quest Diagnostics total number of employees in 2023 was 37,009.958, a 2.4% decline from 2022.

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Employee Geographic Breakdown

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Employee Role Breakdown

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Employee Compensation

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Active Job Postings

Interactive chart of Quest Diagnostics annual active job postings from 2023 to 2025.

  • Quest Diagnostics active job postings in 2025 was 14,356, a 30.2% decline from 2024.
  • Quest Diagnostics active job postings in 2024 was 16,583, a 6.3% decline from 2023.
  • Quest Diagnostics active job postings in 2023 was 17,657, a 150.3% decline from 2022.

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Employee Sentiment

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