Does Fentanyl show up in urine tests?

Both fentanyl and heroin metabolites will show up as part of a complete work up of the most commonly abused drugs/medications and their metabolites. Fentanyl will show up as the parent drug and its metebolite (norfentanyl) in a confirmatory analytical test (LC/MS/MS) to quantities above rougly 1.0 ng/mL. Not sure about the half life, that is, how long it will show in the urine. Since heroin has a very short half life, only its metabolite (6-monoacetylmorphine or 6MAM) will show up in a urine toxicology screen. Even then, 6MAM has a slightly longer half life than morphine and can stick around in the urine for up to a couple days, depending on the detection limit of the analytical instument. Unfortunately, heroin is ultimately metabolized to morphine and, to a small degree, hydromorphone; therefore, if you're not legally prescribed pain medication, the physician should know you are at the very least misusing pain meds. NB: 6MAM levels can be requested by the MD if he/she has reason to believe the person is getting high.