|Downtime form:||A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery|
Screen includes THC with a cutoff of 50 ng/mL for the main metabolite of THC (9-carboxy-THC). All positive screening tests are automatically reflexed to a mail-out confirmation assay that uses liquid chromatography-tandem mass spectrometry (LC/MS/MS) to provide definitive identification and quantitation of 9-carboxy-THC. It is highly unlikely that passive (second-hand) inhalation of marijuana smoke will result in a positive screening test. Research studies have shown that maximum urinary concentrations of 9-carboxy- THC levels only reach 15-20 ng/mL following passive inhalation of heavy marijuana smoke. References: Cone EJ, Johnson RE, Darwin WD, Yousefnejad D, Mell LD, Paul BD, Mitchell J. Passive inhalation of marijuana smoke: urinarlysis and room air levels of delta-9-tetrahydrocannabinol. J Anal Toxicol 1987;11:89-96. Hammett-Stabler CA, Pesce AJ, Cannon DJ. Urine Drug Screening in the Medical Setting. Clinica Chimica Acta 2002;315:125-135.