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The page below is a sample from the LabCE course Drug Metabolism. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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A pain management patient has been prescribed oxycodone. His most recent drug test shows oxycodone at 9,815 ng/mL and oxymorphone below the cutoff. Oxymorphone is a metabolite of oxycodone and is generally detected at about 1/6th the concentration of oxycodone. What is a possible reason for not detecting oxymorphine?

Please select the single best answer