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Quest Diagnostics empowers people to take action to improve health outcomes.
Company Overview

Quest Diagnostics works across healthcare to create a healthier world, one life at a time. We connect people, from clinicians to consumers, with laboratory insights that illuminate a path to better health. With a focus on delivering smarter, simpler testing, we help reveal new avenues to identify and treat disease, empower healthy behaviors and improve healthcare management. Quest Diagnostics serves half the physicians and hospitals in the United States and one in three American adults each year, and our nearly 57,000 employees work together to deliver diagnostic insights that inspire actions to transform lives.

Latest News
07102026

Hair test positivity among American workers reached 19.1% in 2025, potentially reflecting recurring or chronic drug use 15.1% of workers screened for drugs using a hair test were positive for...

07082026

American Oncology Network (AON) and other community oncology providers launching now as part of a pilot program that provides access to Haystack MRD SECAUCUS, N.J., July 8, 2026 /PRNewswire/ --...

06292026

Funding granted to four local organizations -- Florida International University Foundation, Urban Health Partnerships, The Health Council of South, and U.S. Hunger -- with goal to reach up to 15,000 residents over a 2-year period

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Newsroom

Media Coverage
07132026
The Independent
Nearly one in five American workers tested positive for drug use in long-term screenings last year, driven by a rise in cannabis consumption that is forcing companies to reevaluate their hiring practices. According to new data from Quest Diagnostics, 19.1 percent of workers screened via hair analysis in 2025 returned a positive result, representing a 46 percent increase from 2021. Marijuana accounted for 52.5 percent of those positive hair tests.
07082026
American Journal of Managed Care
Quest is the largest reference laboratory to embed oncology molecular ordering into OncoEMR MPI, with projected reach to 4,700 clinicians across ~1,600 community oncology sites. Integration targets administrative friction from multi-biomarker orders and dense reports by reducing ordering steps, accelerating account setup, and returning more usable results inside routine EHR workflows.

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Quest Diagnostics Health Trends™

Quest Diagnostics Health Trends™ is a series of reports from Quest Diagnostics on health conditions affecting a large number of Americans. Published in peer-reviewed journals, at scientific conferences and widely as a public service, the reports are designed to inform health care professionals, patients and policymakers about the status of the nation’s health.

 

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At A Glance...

Quest provides thousands of laboratory tests, ranging from advanced genomic tests for cancer and rare diseases to routine preventive tests for heart disease, diabetes and other chronic conditions. Our medical and scientific staff consists of over 700 M.D.s and Ph.Ds. We maintain approximately 7,700 patient access points, including approximately 2,000 Quest patient service centers, and a logistics team with over 4,000 courier vehicles and nearly 20 aircraft in the United States.

Media Resources

Journalists may contact Quest Diagnostics by emailing mediacontact@questdiagnostics.com