You bet they do, big time! Oxycontin is made from morphine, so, morphine on top of morphine, is a double whammy!
Yes will show up as an opiate
Oxycodone (oxycontin) will NOT show up, morphine will. Morphine/codeine/heroin show up as opiates, oxycodone, hydrocodone etc. Do not metabolize into morphine.