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A member asked:
I am prescribed phentermine and i just failed a ua for amphetemine. the nurse said the phentermine could cause a false+ so they sent it off. will they be able to tell it's my phentermine and nothing else? i sure hope so?
2 doctors weighed in across 2 answers
Phentermine is associated with false positives for Amphetamines. A blood level showing specific levels of phentermine consistent with your prescription and no other amphetamines will clear you for the false positive.
Answered 8/6/2021
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Screening tests are known to have false positives. You could ask for mass spectrometry confirmatory test.
Answered 8/15/2021
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