Opiates/Creatinine:MRto:Pt:Urine:Qn
opiates/creatinine:mrto:pt:urine:qn
Opiates/Creatinine:Mass Ratio:To identify measures at a point in time:Urine:Quantitative
opiates/creatinine:mass ratio:to identify measures at a point in time:urine:quantitative