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Company Summary

Company Overviews

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.

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Rating Reviews

Rating is calculated based on 146 reviews and is evolving.

Featured Reviews

Medical Laboratory Scientist I
4.1
14 August 2026
Great Flexibility in a Stable Clinical Lab Environment
Pros: As a Medical Laboratory Scientist I at Quest Diagnostics, I've found a great amount of work flexibility, which is crucial for managing my personal life. The scheduling options at the Lewisville, TX facility are decent, and my team is quite accommodating with shift swaps. This is a huge plus in the clinical diagnostics industry, where consistent lab operations are vital. The job stability here is also a major benefit. Quest Diagnostics is a well-established company in healthcare, providing a
Cons: While the flexibility is excellent, the workload can sometimes be overwhelming, especially during unexpected peak times or staff shortages. This occasionally impacts day-to-day operations and can feel a bit taxing for Medical Laboratory Scientists. Improvements in staffing models could help alleviate this pressure and prevent burnout.
Advice to Management: Management should continue focusing on proactive staffing solutions to better manage fluctuating testing volumes. Investing in more cross-training for Medical Laboratory Scientists could also improve efficiency and reduce stress during busy periods. Additionally, creating clearer internal growth
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Phlebotomist Representative I Hospital
4.1
14 August 2026
Good Flexibility and Supportive Team in Zeeland
Pros: I've really appreciated the work flexibility as a Phlebotomist Representative I Hospital at Quest Diagnostics. The schedules, especially in a hospital setting in Zeeland, MI, are usually predictable, and management is understanding if you need to swap a shift occasionally, which is excellent for work-life balance. The team here is super supportive, which is crucial in the fast-paced healthcare industry and provides a good company culture. There are good opportunities to learn new venipuncture
Cons: Sometimes, during peak hours or if we're short-staffed, the workload as a Phlebotomist can feel a bit overwhelming, leading to longer wait times for patients. Also, the internal approval process for some administrative tasks can be a little slow, which impacts efficiency. Communication about broader company changes could be more consistent across all hospital sites within Quest Diagnostics.
Advice to Management: Keep fostering the supportive team environment we have in Zeeland. Investing more in cross-training for Phlebotomist Representative I Hospital roles could help manage busy periods more smoothly and improve patient flow for diagnostic services. Streamlining some of the administrative approval
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Medical Laboratory Scientist I
4.0
13 August 2026
Solid place to grow for a lab professional
Pros: The team dynamic here is great; my fellow Medical Laboratory Scientists are supportive and always willing to help out, which is huge in a busy clinical laboratory environment. There are ample opportunities for learning new methodologies and staying current with laboratory testing techniques, which is vital in the ever-evolving healthcare industry. I've also found the leadership at my Lewisville, TX facility to be generally understanding and approachable. They genuinely care about our
Cons: Sometimes the workload can get pretty intense, especially during flu season or unexpected surges in testing demand. While we manage it, staffing levels could sometimes be adjusted to ease the burden. Also, internal approval processes for some initiatives can feel a bit slow, impacting efficiency for our lab operations and making rapid changes difficult.
Advice to Management: To management at Quest Diagnostics, especially in the Lewisville, TX labs: keep fostering that open communication. Focusing on optimizing staffing during peak demand would further enhance employee well-being and reduce potential burnout for Medical Laboratory Scientists. Streamlining some of the
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Common Questions About Quest Diagnostics

Does Quest Diagnostics support remote collaboration for its IT roles, and how is it managed?
What's the dress code like for a Lab Assistant at Quest Diagnostics in a large metropolitan area like New York City?
What is Quest Diagnostics' approach to CEO visibility and leadership communication within a large healthcare diagnostics company?
What's the dress code like for lab technicians at Quest Diagnostics in a large metropolitan area?
Does Quest Diagnostics offer tuition reimbursement for continuing education in the healthcare industry?
Does Quest Diagnostics foster a respectful environment for its lab technicians and other employees across its numerous testing facilities?
Does Quest Diagnostics offer good wellness programs for employees in the healthcare industry?
What kind of questions did the interviewer ask during my interview for a Lab Assistant role at Quest Diagnostics?
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