Urea nitrogen^pre dialysis:MCnc:Pt:Ser/Plas:Qn
urea nitrogen^pre dialysis:mcnc:pt:ser/plas:qn
Urea nitrogen^pre dialysis:Mass Concentration:To identify measures at a point in time:Serum/Plasma:Quantitative
urea nitrogen^pre dialysis:mass concentration:to identify measures at a point in time:serum/plasma:quantitative