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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes False Positive For PCP Drug Test?

Hello went to a pain clinic to get my pain meds before was incarcerated until June 12"5 and half months took ua came up pos for pcp I have never used Pcp and am prescribed Norco soma xanax desoxyn ADHD and depocote I have been with out meds since Feb.Why would pcp be tested pos if I am clean false pos???urine was sent to lab meanwhile still with out meds and have nev medicad.What do I know????
Mon, 20 Apr 2015
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General & Family Physician,  's  Response
Hi
Thanks for posting your query on HCM.
I appreciate your concern for the "false positive" test for PCP.

I read your case diligently, it is unfortunate to know that you have been tested positive for PCP which apparently is a false positive test.

The use of following medications could have been responsible for the false positive test:
Venlafaxine & Imipramine ( used in the treatment of depression and painful nerve conditions).
Other possible drugs are Dextromethorphan, Diphenhydramine,
NyQuil which contains sedating antihistamines, hypnotics and alcohol)
Tramadol (an opioid drug used to treat severe pain) & NSAIDs ( like Ibuprofen, Naproxen, etc) also used for pain associated with inflammation.

So, if you have taken one of the above listed medications, the false positive test is likely to occur.

Hope this answers your query.

A feedback is appreciated.
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What Causes False Positive For PCP Drug Test?

Hi Thanks for posting your query on HCM. I appreciate your concern for the false positive test for PCP. I read your case diligently, it is unfortunate to know that you have been tested positive for PCP which apparently is a false positive test. The use of following medications could have been responsible for the false positive test: Venlafaxine & Imipramine ( used in the treatment of depression and painful nerve conditions). Other possible drugs are Dextromethorphan, Diphenhydramine, NyQuil which contains sedating antihistamines, hypnotics and alcohol) Tramadol (an opioid drug used to treat severe pain) & NSAIDs ( like Ibuprofen, Naproxen, etc) also used for pain associated with inflammation. So, if you have taken one of the above listed medications, the false positive test is likely to occur. Hope this answers your query. A feedback is appreciated.