When they test for M'done in urine (at least on a clinic) they test for it's metabolite (called EDDP for short) & it's ratio to creatinine levels,
There is a drug called Bentyl (Dicycloverine) prescribed for IBS that can potentially cause a false positive. There may be others too. It also depends on how good the lab is that is doing the testing. Sometimes there's sloppy work or cross-contamination, particularly in the 'collection' phase.
I'd request a retest. (Usually, when you get a positive, they retest it with the same sample at the same lab.) So, if possible, I'd ask that it be a new sample w/ a different lab. I'd also check with your Dr. &/or do the research to discover other potential false positive drugs. As IBKleen mentioned, a blood test might be a good option if you're not on any medications. Hope this helped a bit. :)
If you are not on any medications..as for a blood test. They are much more accurate.
depends. what else do you take?