Fractional Excretion of Urea (FEUrea)Prerenal ≤ 35%Loading...BUN or serum ureamg/dLmmol/LSerum creatininemg/dLumol/LUrine ureamg/dLmmol/LUrine creatininemg/dLumol/L사용 적응증통찰 및 주의사항