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Extracted ion chromatograms for Δ9-tetrahydrocannabinol-d0 (THC) [m/z 386, 371, 303], 11-hydroxy-Δ9-tetrahydrocannabinol (11-OH-THC) [m/z 474, 371, 459], and 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THCCOOH) [m/z 371, 473, 488] in human urine fortified at the limit of quantification (LOQ) for each analyte. LOQ were 2.5 ng/mL for THC, 11-OH-THC, and THCCOOH (A). Quantification ions are underlined. MSD combined ion chromatogram (B).
