FENa

Calculates fractional excretion of sodium to help distinguish prerenal azotemia from intrinsic renal injury in acute kidney injury.

What you enter

• Urine sodium (mEq/L)
• Plasma sodium (mEq/L)
• Urine creatinine (mg/dL)
• Plasma creatinine (mg/dL)

Reference

FENa = (UNa × PCr) ⁄ (PNa × UCr) × 100

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Educational decision-support tools. They do not replace clinical judgment, local protocols or specialist advice: verify results before acting on them.