Reliability of urine drug screens: When should you consult ...

The results are summarized below showing the number of positive and negative results identified and the percent agreement between analyzers. Assay (ng/mL) Positive Negative % Agreement Benzodiazepine (200) 80 50 99 Benzodiazepine (300) 61 72 93 Analytical Recovery. Negative human urine specimens were spiked with concentrations of lormetazepam. ................
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