False Positive For Propoxyphene

I'm in pain management. I recently took a pre employment drug test. It came back for Propoxyphene. I take Hydrocodone. I was also stung by yellow jackets 2 days before the test and was given a shot of benadryl at the hospital. I do not take propoxyphene. But it showed up on a 10 panel split test from Medtox. Can anyone tell me why?

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From an outside perspective I can see why Hydrocodone may have been the cause for the false-positive. Reason being is that Propoxyphene is an analgesic in the opioid category; as is Hydrocodone. Unfortunately, the standard tests typically used for screenings lack the sensitivity to distinguish beyond the basic structures of the drug class vs. the drug name. This is where the issue lies.

When it comes to Benadryl (Diphenhydramine); this particular drug is known to cause false positives for benzodiazepines, PCP, & tricyclic antidepressants; so I can easily count this one out of the equation.

I hope this info helps! Is there anyway you can see about getting re-tested?

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