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🫘 Fractional Excretion of Urea (FEUrea)

UseAssess acute kidney injury, especially after diuretics.

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SourceCarvounis CP, et al. Kidney Int 2002

Runs locally in your browser (no PHI uploaded). For licensed clinicians — not a substitute for clinical judgement.
Stored on this device for revisit reminders

This-shift next steps

After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.

Scene next step
📋Renal function / dosingOpen scene pack →
Related scores
Matching pathway
🧭hyperkOpen pathway →
Score + version; reference only — not a substitute for care · no HIS write

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Methodology · worked example, guidelines & full notes
Clinical takeaway

More reliable than FENa when diuretics have been given.

When to use

Assess acute kidney injury, especially after diuretics.

How it works

FEUrea = (urine urea × serum creatinine) / (serum urea × urine creatinine) × 100. < 35% pre-renal; > 50% intrinsic.

Key points

  • More reliable than FENa when diuretics have been given.
  • Urea handling is less affected by diuretics.
  • Interpret with clinical context and urine microscopy.

References

Worked calculation

The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.

Urine urea300 mg/dL
Serum urea (BUN)30 mg/dL
Urine creatinine100 mg/dL
Serum creatinine2.0 mg/dL

→FEUrea20.0%

  • Interpretation：< 35% — suggests pre-renal
  • Formula：(Uurea × SCr)/(Surea × UCr) × 100
Verification & sources · governance
FAQ

Frequently asked questions

What are the limits and cautions when using Fractional Excretion of Urea (FEUrea)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
Does Fractional Excretion of Urea (FEUrea) upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Fractional Excretion of Urea (FEUrea) calculated in practice? Can you show a worked example?
Inputs: Urine urea 300 mg/dL, Serum urea (BUN) 30 mg/dL, Urine creatinine 100 mg/dL, Serum creatinine 2.0 mg/dL → Result: FEUrea 20.0 %（Interpretation: < 35% — suggests pre-renal, Formula: (Uurea × SCr)/(Surea × UCr) × 100）
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