Carboxy tetrahydrocannabinol/Creatinine:MRto:Pt:Urine:Qn
carboxy tetrahydrocannabinol/creatinine:mrto:pt:urine:qn
Carboxy tetrahydrocannabinol/Creatinine (U) [Mass ratio]
carboxy tetrahydrocannabinol/creatinine (u) [mass ratio]