Leading, Growing Company

As the world's leading provider of diagnostic testing, information and services, we are committed to improving human health through the delivery of quality diagnostic insights. We continue to cement our position as industry leader through our breakthrough innovations in science and technology, our advanced health information technology solutions and our support of clinical trials. Join us on our quest to improve healthcare.

serious woman in suit

The numbers tell an important part of the story:

  • Approximately 45,000 employees, including almost 900 MDs and  PhDs

  • 2,200 patient service centers in communities across the U.S. 

  • 30-plus regional labs and 125 rapid-response labs in our  network 

  • Quest serves 50% of hospitals and physicians in the U.S.   

  • Annually, 1/3 American adults are served by Quest Diagnostics

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But we're about far more than just numbers. At Quest Diagnostics, taking care of people is our business. There are millions of patients who count on us, and we recognize that without the hard work and dedication of our 45,000 employees, our services would not be possible.


For example, through our science and innovation team and with external partners, we’ve developed breakthrough laboratory tests, many of which are now the standard of care. We are a leading provider of cancer diagnostics and gene-based testing, and are one of the largest providers of global central laboratory services for clinical research trials on new drugs.

Thanks to innovations like these and many others, Fortune named us one of the “World’s Most Admired Companies” for three consecutive years; Forbes consistently includes us in their list of "America's Best Employers"; and DiversityInc has named us a "Noteworthy Company" for the second consecutive year in 2018. Read more about our awards and honors

Benefit from the wealth of resources and opportunities that come with working for a leader. Learn about our career opportunities.