What Is LabCorp and Quest?
LabCorp and Quest Diagnostics are the two largest clinical laboratory companies in the United States, processing most routine blood and stool testing ordered by clinicians.
Classification: Diagnostics & Laboratory Methods › LabCorp and Quest
Key Takeaway
LabCorp and Quest perform most standard US lab testing. Specialized parasite and chronic-illness testing often requires dedicated specialty labs.
Why This Matters
LabCorp and Quest offer a wide range of standard tests including complete blood counts, metabolic panels, thyroid tests, and basic parasite stool exams. Their automated workflows are efficient for common testing but may be less sensitive for some specialized applications. For complex or chronic-illness cases — detailed parasite panels, mycotoxin testing, advanced Lyme panels, functional medicine comprehensive panels — specialty labs like Parasitology Center Inc., Great Plains Laboratory, RealTime Labs, and others are often used.
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Frequently Asked Questions
What are LabCorp and Quest?
The two largest clinical laboratory companies in the United States, processing most routine medical lab testing.
Are their parasite tests reliable?
For common organisms they are reasonable, but routine stool ova and parasite exams have known sensitivity limitations. Specialty labs often catch organisms routine tests miss.
When should I use a specialty lab?
When working up complex chronic conditions, when routine tests have been negative but symptoms persist, or when testing for specific organisms or mycotoxins not on standard panels.
