Guanidinoacetate/Creatinine:SRto:Pt:Ser/Plas:Qn
guanidinoacetate/creatinine:srto:pt:ser/plas:qn
Guanidinoacetate/Creatinine [Molar ratio] in Serum or Plasma
guanidinoacetate/creatinine [molar ratio] in serum or plasma