Oxycodone detection time using a urinalysis?

I have a urinalysis in 12 days, I occasionally use oxycodone 15mg's. As occasionally I mean once too twice a week. How long is the detection time?

Any precautionary measures I should take to pass?

I realize that one of these measures is to stop taking it. I am passed that point.

They are the instant release oxycodone.

: http://alcoholdrugstreatment.info/oxycodone-detection-time-using-a-urinalysis