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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.
Anticonvulsants or antiepileptic drugs such as barbiturates (Phenobarbital), benzodiazepines, bromides, fatty acids (valproic acid), fructose derivatives, GABA analogs, Primidone and triazines can also cause false positive tests. Anti-Parkinson medications also determine a rise of the hCG level in urine.