will OxyContin use result in a positive (failed) drug test when testing for opiates?

I need to take a drug test for a new job and am concerned that Oxycontin will show up in the opiates test. The urine test was conducted aproximately 8 days after a one time Oxycontin use, should I be worried about a potential failed test?

: http://alcoholdrugstreatment.info/will-oxycontin-use-result-in-a-positive-failed-drug-test-when-testing-for-opiates