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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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I had a false positive random drug test and was taking

Resolved Question:

I had a false positive random drug test and was taking pseudoephedrine hydrochloride the day before. Could this cause a hot test?
Submitted: 5 years ago.
Category: Drug Testing
Expert:  Family Physician replied 5 years ago.
Which drug was identified on the drug test?

Was the drug test an immunoassay (home test, dipstick or other "instant" test) or gas chromatography-mass spectrometry (GC/MS)?
Customer: replied 5 years ago.
Amphetamine test was done at work in a lab. It was a split test that was sent to a quest lab.
Expert:  Family Physician replied 5 years ago.
I assume then that the test was in fact confirmed with GC/MS. This technology really is the "gold standard" or forensic testing and pseudoephedrine would NOT cause a false positive.

You should however check if this was confirmed with GC/MS. If you have not used any drugs, then your option would be to request the split specimen be tested to confim the findings on the first bottle.
Customer: replied 5 years ago.
Just wondering why several web sites say pseudoephedrine use will show amphetamines. Is there some confusion on this.
Expert:  Family Physician replied 5 years ago.
Pseudoephedrine can cause false positive on the SCREENING immunoassay, but NOT on a GC/MS confirmed test.
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