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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Does Bactrim Show False Positive Result For Benzo In The Urine Drug Screen?

hi, would Bactrim ds possibly give a false positive on a urine drug screen? I have never taken a benzo in my life and I came up positive so I had the nurse at spectrum send my urine out to the lab because the stick urine test came up positive for benzoS!!! what can I do I am innocent I offererd blood but the phlabotamist was not there is this common?
Fri, 30 Jun 2017
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Addiction Medicine Specialist 's  Response
Hair testing is very specific.
http://www.aafp.org/afp/2010/0301/p635.html this is a good reference.
bactrim just doesn't seem likely to be the cause but other drugs could be. Frankly most false positives for the dipstick are never found as to the cause. The more detailed and accurate tests (mass spec) do not have false positives very often at all.
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Does Bactrim Show False Positive Result For Benzo In The Urine Drug Screen?

Hair testing is very specific. http://www.aafp.org/afp/2010/0301/p635.html this is a good reference. bactrim just doesn t seem likely to be the cause but other drugs could be. Frankly most false positives for the dipstick are never found as to the cause. The more detailed and accurate tests (mass spec) do not have false positives very often at all.