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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.
Aside from when this class of drugs is specifically tested for, some of them including amitriptyline can test positive for opiates for up to three days after use. Even quinine in tonic water can also cause a positive result for opiates.