I take Oxycodone 30mg & Opana ER 40mg, & today at the Dr.'s office the Opana ER didn't show up on a urine drug test. I have been out of my Opana for about a week due to an appointment mistake & since it didn't show up in my urine, they took a blood test and sent it off. I was just wondering how long the Opana would show up in a blood test.