[Toxicology] false positives for routine drug screens

David Loughmiller via toxicol%40net.bio.net (by davidloughmiller At charter.net)
Sat Nov 4 22:07:14 EST 2006


Initially when SAMHSA came out with the testing rules in the late 80s, the 
threshold was set at 300 ng/mL.  At that cutoff, there were some people who 
were taking poppy seeds that produced an initial screening positive.  In 
1995, the cutoff was changed to 2000 ng/mL, which resulted in much less 
chance for false positive results to occur.  In either case, the specimen 
was confirmed by GC/MS which is the confirmatory method.  At the new level, 
a significant amount of poppy seeds would need to be consumed before a 
positive would be reported.

I hope that this helps.
DAVID LOUGHMILLER
----- Original Message ----- 
From: "Sandra Munsters" <smunsters At mac.com>
To: <toxicol At magpie.bio.indiana.edu>
Sent: Thursday, November 02, 2006 1:51 PM
Subject: [Toxicology] false positives for routine drug screens


> I've heard poppy seeds can cause a false positive drug screen.  What 
> other common foods or over-the-counter meds can do this?
>
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