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FEUrea Calculator (Fractional Excretion of Urea)

Health & Fitness

Calculate the fractional excretion of urea (FEUrea), an alternative to FENa that remains useful in patients on diuretics.

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mg/dL
1 mg/dL3,000 mg/dL
mg/dL
0.1 mg/dL15 mg/dL
mg/dL
1 mg/dL250 mg/dL
mg/dL
1 mg/dL400 mg/dL

FEUrea

25.00

Fractional excretion of urea. Educational reference only, not a substitute for clinical judgment.

Interpretation

General interpretation based on published reference thresholds. Under 35% - suggests a prerenal cause

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Odeh Ahwal

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Odeh Ahwal
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Frequently Asked Questions

How is FEUrea different from FENa?

FEUrea uses urea instead of sodium, which makes it useful in patients taking diuretics, since diuretics affect sodium handling but do not meaningfully change urea handling the same way.

What does a low FEUrea suggest?

A FEUrea under 35% suggests a prerenal cause of acute kidney injury, meaning the kidneys are functioning normally but receiving reduced blood flow.

Can FEUrea and FENa disagree?

Yes, especially in patients on diuretics, where FENa may be falsely elevated while FEUrea remains more reliable for identifying a prerenal cause.

Is this calculator a substitute for medical advice?

No. This is an educational reference implementation of the standard FEUrea formula, not a substitute for a physicians clinical assessment.

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