Liquid chromatography tandem mass spectrometry was used to identify and confirm the presence of 6-acetylmorphine and morphine in 22,361 urines of pain management patients. Thirty urines tested positive for 6-acetylmorphine above a cutoff of 10 ng/mL. Twenty-three percent of the patients with urinary concentrations of 6-acetylmorphine above 10 ng/mL had urinary morphine concentrations below 300 ng/mL.
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| http://dx.doi.org/10.1097/FTD.0b013e3181b9da04 | DOI Listing |
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