Comparison of a TLC method with EMIT and GC/MS for detection of cannabinoids in urine.
Urine specimens were analyzed in parallel with a new TLC method, an EMIT assay, and a reference GC/MS method. At a 9-carboxy-THC cutoff of 20 ng/mL, the TLC method correctly identified 92% of the positive urines and 97% of the negative urines. In contrast, only 63% of the urine specimens shown by GC/MS to contain greater than 20 ng/mL of 9-carboxy-THC were identified as positive by the EMIT d.a.u. assay at the 100-ng/mL cannabinoid cutoff.
Foltz
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RL
Center for Human Toxicology, University of Utah, Salt Lake City 84112.
Sunshine
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D002186:Cannabinoids / Q000652:urine*; D002855:Chromatography, Thin Layer / Q000379:methods; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006801:Humans; D007124:Immunoenzyme Techniques
D002186:Cannabinoids