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Family Physician
Family Physician, Board Certified MRO
Category: Drug Testing
Satisfied Customers: 12816
Experience:  Medical Review Officer - Physician Trained and certified in drug test interpretation
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Positive urine drug test caused by ginkgo biloba? Thank you

Customer Question

Positive urine drug test caused by ginkgo biloba? Thank you
Submitted: 1 year ago.
Category: Drug Testing
Expert:  Family Physician replied 1 year ago.

I have not found any scientific studies showing ginkgo as a cause of false positive drug tests. Even if this were theoretically possible, this would only influence the screening immunoassay tests. GC/MS confirmation testing on any specimen would eliminate any theoretic interference with the screening immunoassay.

You should know that ginkgo is a "impermissible" supplement under NCAA rules (for student athletes)

Expert:  Family Physician replied 1 year ago.

If a screening test such as a home test, dipstick or other "instant" test is positive, it should be repeated with GC/MS confirmation on the same specimen.