Creatinine^2D post XXX challenge:SCnc:Pt:Ser/Plas:Qn
creatinine^2d post xxx challenge:scnc:pt:ser/plas:qn
Creatinine [Moles/volume] in Serum or Plasma --2 days post XXX challenge
creatinine [moles/volume] in serum or plasma --2 days post xxx challenge