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Rodger L. Foltz, Irving Sunshine, Comparison of a TLC Method with EMIT® and GC/MS for Detection of Cannabinoids in Urine, Journal of Analytical Toxicology, Volume 14, Issue 6, November-December 1990, Pages 375–378, https://doi.org/10.1093/jat/14.6.375
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Abstract
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.
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