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For the pain management panel only, regardless of the screen results, GC/MS confirmation for the following drugs are completed and reported individually as positive/negative with a detection limit of 100 ng/mL: morphine, codeine, oxycodone, oxymorphone, hydrocodone, hydromorphone.
According to Rapuri and colleagues, nasal decongestants and pseudoephedrine, a cold medicine ingredient, can cause false positives for amphetamines on a urinary drug screen. They add that Nyquil, an over-the-counter cold medication, can give a false positive for methadone.