I am having trouble with my pain management doctor stating that I am not properly using medicine which he has prescribed. He performed a urine test and it was negative in both the office and in the lab. I am certain that this is incorrect and cannot explain what is happening. Can you offer an explanation? Help!!

KeepItSimpleStupid

Not sure I can, but oxycodone, oxymorphone, hydrocodone, hydromorphone are very similar in pronunciation.

Is it possible that the wrong test was ordered?

I'm kinda surprised that he wasn't testing for other painkillers, not the one you are on.

Can you offer what how much drug you took prior to the urine screen and how long before the urine screen was the test after dosing?

Reminder that oxycodone is Oxycontin. Was it the SR/ER version?

From the Prescribing info:

Oxycodone is extensively metabolized
and eliminated primarily in the urine as both conjugated and unconjugated metabolites. The apparent elimination half-life of oxycodone following the administration of OxyContin® was 4.5 hours compared to 3.2 hours for immediate-release oxycodone.

What that says is that it will be gone in 5x times 4.5 hrs or 3.2 hrs. This also depends on your metabolism.