Magnus Diagnostic Laboratories
Where Accuracy & Precision Meet

"Providing Excellence in Laboratory Testing to Well-Served & Under-Served Communities Alike"

Your Go-To Independent Clinical Reference Laboratory

Whether you're testing for toxicology or chronic disease, diagnostics play a massive role in maintaining a high quality of life. But finding a lab you can trust is not always easy. At Magnus Diagnostics Laboratories, we go above and beyond to deliver accurate, timely testing that gives both you and your patients peace of mind.

Find out more about our lab services.
Call (301) 654-5550

About Us

Magnus Diagnostics Laboratories is an independent clinical reference laboratory in Bethesda, MD, that serves clients throughout the nation. Owned and operated by Christine McNair — a certified laboratory scientist with the American Society of Clinical Pathologists — we are a woman owned business with a passion for providing excellent services to well-served and underserved communities alike.

When you choose our facility, you're never just a number. Our lab is staffed by a team of experts with the skills and knowledge to utilize next generation of diagnostic capabilities, including LCMS (liquid chromatography mass spectrometry). Additionally, we pride ourselves on working with the utmost integrity, running your data through a stringent process and never deleting, altering, modifying, or skewing the findings and giving you high-level access along the way. If you're looking for accurate laboratory tests from an organization dedicated to improving health care, you've come to the right place.


Thank you for your interest. We look forward to hearing from you soon.

(301) 654-5550
Hours of Operation
Monday - Friday:
9:00 AM - 5:00 PM
4641 Montgomery Ave #400
Bethesda, MD 20814

US Federal Contractor Registration Verified Vendor 2019-2020