guaiFENesin/Creatinine:MRto:Pt:Urine:Qn:Confirm
guaifenesin/creatinine:mrto:pt:urine:qn:confirm
guaiFENesin/Creatinine [Mass Ratio] in Urine by Confirmatory method
guaifenesin/creatinine [mass ratio] in urine by confirmatory method