There has been much debate in urine drug testing over what criteria should be applied to total codeine and total morphine concentration data to determine the likelihood that a urine donor has used heroin and whether such use can be demonstrated by the presence of 6-acetylmorphine. After determining that the stability of 6-acetylmorphine in frozen urine is adequate for a period of at least two years, a database of over 100 codeine and/or morphine positive urine specimens was subjected to relative operating characteristic analysis to identify a criterion that would indicate a high probability of detecting 6-acetylmorphine in a specimen and thus confirming heroin use. A two-fold criterion was identified. By using a criterion that requires the total morphine concentration to be greater than 5.000 mg/L and the total codeine to total morphine ratio to be less than 0.125, one can predict the presence of 6-acetylmorphine with a sensitivity of 92%, a specificity of 79%, and an overall accuracy of 73%. Although this criterion is statistically the most accurate in terms of both sensitivity and specificity for the data analyzed by the author, the results of other criteria are presented to aid toxicologists and medical review officers in determining if analysis for 6-acetylmorphine is likely to produce useful results.
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