Nephrology

Fractional Excretion of Sodium (FENa)

Differentiates prerenal from intrinsic AKI

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Input Parameters

Serum Sodium

mEq/L

Urine Sodium

mEq/L

Serum Creatinine

mg/dL

Urine Creatinine

mg/dL

Recent Diuretic Use

Clinical Note (Optional)

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Other evidence-based tools commonly used alongside this calculator

Creatinine Clearance (Cockcroft-Gault)

For drug dosing adjustments - NKF recommended for research only

Fractional Excretion of Urea (FEUrea)

Alternative to FENa when on diuretics

Kidney Failure Risk Equation (KFRE)

2-year and 5-year risk of kidney failure (NKF recommended)

eGFR Calculator (NKF Guidelines)

Comprehensive eGFR calculator with CKD staging per National Kidney Foundation