2 replies to this topic

[jack black]

I personally know a person who takes a prescription for bupropion who went to ER and her urine drug screen came back positive for ecstasy. she called me for answers (i'm sort of in a medical field and my friends and family keep calling for advice) and i found out that bupropion often gives false positive results for ecstasy (and amphetamines) indeed. i also found out that selegiline can give false positive result for amphetamines. I obviously knew about poppy seeds and opiates.

 

i googled some more and there is a whole lot of more false positives: http://www.medscape....rticle/726897_2

 

now, my question, how about all those "OTC" (some of them are prescription only outside USA) supplements? is there going to be a surprise for me when my employer wants my random urine sample? i'm thinking it would be hard to fight a false positive when i can't produce a script.

 

 

Edited by jack black, 06 November 2016 - 01:34 AM.

[jack black]

I see that no one cares. I found another example:

 

 

Hordenine has been found to interact with Morphine testing drug kits, which extended to oxymorphone, hydromorphone and apomorphine with less reactivity to tests for etorphine- and buprenorphine; the authors suggested that high dose Hordenine can cause a false positive for Morphine and related structures.^[17]

https://examine.com/...ents/Hordenine/

[Finn]

Chemical structure similarities may result in cross-reactivity with antibodies used in urine drug screen immunoassays.

 

Because they don't want to convict innocent, or give free ticket for bupropion users to use illegal substances, after cheaper and faster immunoassay test, there is second round of testing with Gas chromatography–mass spectrometry

 

 

https://en.wikipedia...ss_spectrometry

 

Mass spectrometry can recognize even different isotopes. It can't give false positive. 

 

Though I suppose most employers doing drug tests wouldn't be happy of employees using research chemicals or "non controlled" prescription drugs without prescription.

Edited by Finn, 23 May 2017 - 06:55 PM.