Blood cannabinoid molar metabolite ratios are superior to blood THC as an indicator of recent cannabis smoking.
Michael J KosnettMing MaGregory DooleyGeorge Sam WangKyle FriedmanTimothy L BrownThomas K HenthornAshley Brooks-RussellPublished in: Clinical toxicology (Philadelphia, Pa.) (2023)
In occasional and daily users, the blood cannabinoid molar metabolite ratios were superior to whole blood Δ9-tetrahydrocannabinol as indicators of recent cannabis smoking. We recommend measurement and reporting of Δ9-tetrahydrocannabinol, 11-hydroxy-Δ9-tetrahydrocannabinol, and 11-nor-9-carboxy-Δ9-tetrahydrocannabinol, and their molar metabolite ratios in forensic and safety investigations.