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Nephrology
Calculate the BUN/Creatinine ratio to distinguish pre-renal from intrinsic acute kidney injury. Normal ratio 10–20. Ratio >20 suggests pre-renal azotemia; <10 suggests intrinsic renal disease.
Formula
BUN/Cr Ratio = BUN (mg/dL) / Creatinine (mg/dL). Normal 10–20.
Inputs
Nephrology
Calculate the Fractional Excretion of Sodium (FENa) to differentiate pre-renal azotemia (FENa <1%) from intrinsic renal disease such as ATN (FENa >2%) in acute kidney injury.
Formula
FENa (%) = (Urine Na × Serum Cr) / (Serum Na × Urine Cr) × 100
Inputs