Fractional Excretion of Urea

Helps differentiate prerenal azotemia from acute tubular necrosis when diuretics were used.

FEUrea

Patient parameters

Adjust values, then click Calculate.

Blood urea nitrogen (mg/dL)

0–1000

Serum creatinine (mg/dL)

0–1000

Urine urea

50–1000

Urine creatinine

1–300

Results

FEUrea: 300 %

What this calculator does

Fractional Excretion of Urea helps you estimate helps differentiate prerenal azotemia from acute tubular necrosis when diuretics were used. The result is computed instantly in your browser and is intended for clinicians, students, and informed patients reviewing screening values.

Formula and variables

Displayed formula: FEUrea

The engine evaluates: FEUrea (%). Variable names match the input field keys so you can trace each step from entry to output.

How to use this tool

1. Open the Fractional Excretion of Urea and enter your values using the units shown beside each field.
2. Review that inputs are within the typical physiological range before you calculate.
3. Read the result together with the interpretation notes below and your local clinical context.

How to interpret the result

Compare the calculated value with established reference intervals for your population. A single number rarely defines management—combine it with symptoms, trends over time, medications, and physical examination. If the result is unexpected, repeat the calculation with verified inputs before acting on it.

Clinical context

Renal estimates fluctuate with hydration, muscle mass, and acute illness. Trend values over time and correlate with urine studies and blood pressure control.

Limitations and disclaimer

This tool supports education and clinical triage only. It does not replace professional medical advice, diagnosis, or treatment. Reference ranges vary by laboratory, age, pregnancy status, and comorbidity. Always confirm critical decisions with institutional protocols and qualified clinicians.