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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.
For amphetamines, most incidents of false positives can be related to a drugâs structure, but case reports and retrospective reviews have associated many drugs with false positives. Following a positive drug screening, the possibility of a false positive always should be considered. Upon admission, the patientâs routine immunoassay for amphetamines showed a negative result, but after 3 days, a repeat analysis was positive for amphetamine. A confirmatory test was ordered and identified IV phenylephrine as a likely cause of the false positive.