Input interpretation
renal failure index
Equation
RFI = (U_Na Cr)/U_Cr | FE_Na = (U_Na Cr)/(S_Na U_Cr) | RFI | renal failure index S_Na | serum sodium Cr | serum creatinine U_Na | urine sodium U_Cr | urine creatinine FE_Na | fractional excretion of sodium
Input values
serum sodium | 140 mmol/L (millimoles per liter) serum creatinine | 0.8 mg/dL (milligrams per deciliter) urine sodium | 150 mmol/L (millimoles per liter) urine creatinine | 130 mg/dL (milligrams per deciliter)
Results
renal failure index | 0.9% fractional excretion of sodium | 0.7% (prerenal failure)