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Chino Hills, CA
A 27-year-old male asked:

Can a lab urine drug test differentiate the use of tylenol (acetaminophen) #3 w/ codeine & heroin 3 days later? my drug class said i used heroin when i took tylenol (acetaminophen) 3

1 doctor answer2 doctors weighed in
Dr. John Gaffney
Psychiatry 26 years experience
Retest: One of the metabolites of codeine is morphine - but not heroin. Be aware though, if it was a low yield test (ie, like the kind you buy at the grocery store) - these usually give you a positive result for any opiate. Anything more specialized (ie, laboratory study ordered by a doctor) - would use mass spectrometry and differentiate every substance independently. Hope that helps!
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Chino Hills, CA
A 27-year-old male asked:

Can lab urine drug test differentiate the use of Tylenol (acetaminophen) #3 w/ codeine & heroin 3 days after last use? My drug class said I used heroin when I took T3

1 doctor answer2 doctors weighed in
Dr. Andrew Germanovich
Pain Management 14 years experience
Depends on test type: Confirmatory test with gas or liquid chromatography will give a definitive result. Heroin is metabolized to 6-AM and eventually to morphine. Codeine is metabolized directly to morphine. If your test was done with a test strip, I would challenge it's results. If it was GC or HPLC then you're guilty.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Mar 2, 2015

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