Fractional Excretion of Sodium (FENa) Calculator
Result
Fractional Excretion of Sodium (FENa) Calculator — free online calculator.
Formula
- Fractional Excretion of Sodium (FENa) Calculator calculates its result from Urine sodium, Plasma sodium, Urine creatinine, Plasma creatinine. It uses the formula FENa = (urine Na × plasma Cr) ÷ (plasma Na × urine Cr) × 100. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Urine sodium, Plasma sodium, Urine creatinine, Plasma creatinine. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Fractional Excretion of Sodium (FENa)
- Urine sodium: 20
- Plasma sodium: 140
- Urine creatinine: 100
- Plasma creatinine: 2
Using Urine sodium = 20, Plasma sodium = 140, Urine creatinine = 100, Plasma creatinine = 2, the calculated result is 0.2857142857.
Sample result: Calculating…
Frequently asked questions
What does the Fractional Excretion of Sodium (FENa) calculate?
Fractional Excretion of Sodium (FENa) Calculator — free online calculator.
Which values should I enter?
Enter Urine sodium, Plasma sodium, Urine creatinine, Plasma creatinine using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: FENa = (urine Na × plasma Cr) ÷ (plasma Na × urine Cr) × 100.
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.