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10-panel urine tests may/or may not specifically screen for Oxycodone. As you likely know, most urine tests specifically target morphine, 6-am, codeine... but NOT oxycodone.
That's the first issue....

Look harder, plenty of reference materials... but sorry, don't have time to educate everyone all the time.

Foxy can disagree... it's what make's the world go round but go to Employee Drug Testing. Drug Testing Company. Workplace Drug testing. Avitar Inc.... and decide who is likely correct.

Moderator is "technically correct" that it can take several days to "leave the system". But at a 2000 ng/ml opiate cut-off on most urine tests... and the fact the most urine tests don't target oxy...

Foxy is clearly not knowledgeable on the topic. Bloodstream WILL NOT maintain drugs for longer than a day or so... typically only hours.
Urine test for metabolites... which only can go out 3-5...

Most urine tests DON'T screen for oxy.

Up to 2-3 days

Yes.

Not long... a few, to several hours

No, will not show up, as most urine tests don't screen for oxy... and level is likely not high enough in your case.

As you know already, taking oxy for a headache is pretty dumb.

See a doc... but basically you need to taper off using various concentrations of opiate-based drugs.