I do not know my clinic's lab protocols, but each time I go (every month), I have to drop a urine drug test. I am on Fentanyl and Oxycodone. I am a bit short on Fentanyl this month due to patches falling off, experimentation, etc. My question is, do Fentanyl and oxycodone show up the same in a urine drug test, being that they are both Opiods, I believe. I do know that they at least test for tramadol as it came back when I wasn't supposed to be on it. Wondering if my oxycodone consumption can cover the absence of the fentanyl (as I realize neither one stays in the system for long.) Aside from the obvious advice being to take as prescribed so as not to be short, any other advice, or do you know whether they test the same in urine??? Thanks in advance!!!8(