R-beta aminoisobutyrate/Creatinine:SRto:Pt:Urine:Qn
r-beta aminoisobutyrate/creatinine:srto:pt:urine:qn
R-beta aminoisobutyrate/Creatinine (U) [Molar ratio]
r-beta aminoisobutyrate/creatinine (u) [molar ratio]