A member asked:

I have been on methadone and oxycodone for several years for knee and back injury. i just tested pos. for fentanyl. how can that be?

A doctor has provided 1 answer
Dr. Richard Pollard answered

Specializes in Anesthesiology

Nonspecific tests: Most drug tests do not differentiate between the opioids. The drugs that you are on could give a false-positive reading for a different narcotic, depending on the test.

Answered 4/24/2015

5.2k views

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