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  • Title: Comparison of a TLC method with EMIT and GC/MS for detection of cannabinoids in urine.
    Author: Foltz RL, Sunshine I.
    Journal: J Anal Toxicol; 1990; 14(6):375-8. PubMed ID: 2087098.
    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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