FeNa Calculator
Calculate the Fractional Excretion of Sodium (FeNa) to differentiate between pre-renal and intrinsic acute kidney injury.
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Formula
Measures the percentage of sodium filtered by the kidney that is excreted in the urine.
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Frequently Asked Questions
What does a FeNa < 1% mean?
A FeNa below 1% suggests a pre-renal cause (like dehydration), where the kidneys are aggressively reabsorbing sodium.
What does a FeNa > 2% mean?
A FeNa above 2% suggests intrinsic renal damage, such as Acute Tubular Necrosis (ATN).
Can diuretics affect FeNa?
Yes. Diuretics increase sodium excretion, which can make a pre-renal state look like an intrinsic one. In such cases, the Fractional Excretion of Urea (FeUrea) is often used instead.
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