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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Can Cause False Positive Drug Test Report For Cocaine?

a family member submitted to a hair follicle test and showed 507 pg/mg for benzoylecgonine. This is a very low concentration. From what we have read most test results are in ng, which is much higher than pg. Hair tests show for a long period of time. The member insists they have not knowingly used cocaine. What may cause this reading, or what may cause a false positive?
Tue, 27 Nov 2018
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General & Family Physician 's  Response
Hi,

If the member denies it taking, it may be possible that he had taken some product which was adulterated with cocaine.

Hope I have answered your query. Let me know if I can assist you further.

Regards,
Dr. Varinder Joshi,
General & Family Physician
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What Can Cause False Positive Drug Test Report For Cocaine?

Hi, If the member denies it taking, it may be possible that he had taken some product which was adulterated with cocaine. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Varinder Joshi, General & Family Physician