It depends on how detailed the test is. They are both opiates but sometimes some tests just check for morphine derived opiates which the morphine will show on but not the oxycodone-it is a thebaine derived opiate. If the test tests for both morphine derived and thebaine derived opiates (which most pain management tests will test for both but an employment screen may not) they will both show up but show up different. I was lucky on my last employment screen-they checked for only morphine based opiates so I showed clean even though I take oxycodone. They didnt test for the thebaine derived opiates. It is very confusing, I know. It is best if you are being tested to stick with what you are legal to have present in your urine. If you have an Rx for MSIR then dont take oxycodone and vice versa.
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