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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.
If you do not inform them, it â¦ could potentially show as a false positive for opiates. This is from Levaquins web site: Some quinolones, including levofloxacin, may produce false-positive urine screening results for opiates using commercially available immunoassay kits.Confirmation of positive opiate screens by more specific methods may be necessary..o â¦ , Levaquin (levofloxacin) -- an antibiotic -- will not light up a positive on any modern drug screen.