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What Causes False Positive Hair Follicle Test Result?

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Posted on Wed, 11 Mar 2015
Question: is their such a thing as a false positive on a 5 panel hair test
failed for meth and marijuana and what levels are acceptable ?
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Answered by Dr. S. Samanta (21 minutes later)
Brief Answer:
External contamination/adulteration might cause this!

Detailed Answer:
Hi!Thanks for writing to HCM!

Now-a-days, hair follicle/hair testing is an important tool in forensic/toxicology medicine as drugs stay in the hair! So detection is dependent on the length submitted for testing. A standard hair drug test is 1 ½” and detected up to 90 days of exposure and earliest by 7 days!

Following drugs are tested in 5 panel hair test: Marijuana (THC), Amphetamine, Cocaine, Opiates and Phencyclidine (PCP).

False positive results might come if External contamination/adulteration occurs to the sample before processing or before reaching to the laboratory!

Hope this answers your question.

If you need any further clarification please write to me.

Regards,
Above answer was peer-reviewed by : Dr. Shanthi.E
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Answered by
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Dr. S. Samanta

Pathologist and Microbiologist

Practicing since :2004

Answered : 1107 Questions

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What Causes False Positive Hair Follicle Test Result?

Brief Answer: External contamination/adulteration might cause this! Detailed Answer: Hi!Thanks for writing to HCM! Now-a-days, hair follicle/hair testing is an important tool in forensic/toxicology medicine as drugs stay in the hair! So detection is dependent on the length submitted for testing. A standard hair drug test is 1 ½” and detected up to 90 days of exposure and earliest by 7 days! Following drugs are tested in 5 panel hair test: Marijuana (THC), Amphetamine, Cocaine, Opiates and Phencyclidine (PCP). False positive results might come if External contamination/adulteration occurs to the sample before processing or before reaching to the laboratory! Hope this answers your question. If you need any further clarification please write to me. Regards,