FEUrea (Fractional Excretion of Urea)
Alternative to FENa when the patient has received diuretics.
RESULT
FEUrea (Fractional Excretion of Urea)
What is FEUrea (Fractional Excretion of Urea)?
Alternative to FENa when the patient has received diuretics. FEUrea is intended for use in: Adults.
How to Use the FEUrea Calculator
- Enter Urine urea nitrogen in mg/dL.
- Enter Plasma urea nitrogen (BUN) in mg/dL.
- Enter Urine creatinine in mg/dL.
- Enter Plasma creatinine in mg/dL.
- Click Calculate to see your result and interpretation.
Formula & Version
This calculator uses formula version 1.0, last reviewed September 2026.
Clinical Considerations & Limitations
- Less well validated than FENa overall, but more robust in diuretic-treated patients.
References
- Kaplan AA, Kohn OF, Miner Electrolyte Metab 1992;18:89-94
Frequently Asked Questions
What is FEUrea (Fractional Excretion of Urea)?
Alternative to FENa when the patient has received diuretics.
Who is FEUrea intended for?
Adults. Always confirm applicability to your specific patient before use.
What are the limitations of FEUrea?
Less well validated than FENa overall, but more robust in diuretic-treated patients.
What formula or reference does FEUrea use?
Kaplan AA, Kohn OF, Miner Electrolyte Metab 1992;18:89-94
Is FEUrea a diagnosis?
No. FEUrea produces a score or estimate to support clinical decision-making — it is not a diagnosis and should be interpreted alongside full clinical judgement.
Medical Disclaimer: Medical calculators are provided for informational and educational purposes only. Results should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always verify results with a qualified healthcare professional.
