Fractional Excretion of Sodium (FENa) Calculator

About Fractional Excretion of Sodium (FENa) Calculator

Helps separate prerenal from intrinsic kidney injury. The Fractional Excretion of Sodium (FENa) Calculator on Picscaler gives you the answer instantly in your browser, with no sign-up.

Inputs: Urine sodium (mmol/L), Plasma sodium (mmol/L), Urine creatinine (mg/dL) and Plasma creatinine (mg/dL). Results shown: FENa and Interpretation.

Formula: FENa % = (urine Na x plasma creatinine) / (plasma Na x urine creatinine) x 100. Unreliable with diuretics; consider FEUrea instead.

This tool is for education and information. It does not replace clinical judgement, so confirm results against your laboratory's reference ranges and local guidelines.

How to use Fractional Excretion of Sodium (FENa) Calculator

1. Enter Urine sodium (mmol/L), Plasma sodium (mmol/L), Urine creatinine (mg/dL) and Plasma creatinine (mg/dL).
2. Press Calculate.
3. Read FENa and Interpretation in the result table.
4. Use the formula and notes under the result to check the working.

Frequently asked questions

Is Fractional Excretion of Sodium (FENa) Calculator free?

Yes. Fractional Excretion of Sodium (FENa) Calculator is completely free to use on Picscaler.

Do I need to create an account?

No. You can use it straight away without signing up.

Is my data safe?

Your input is processed in your browser on your own device and is not uploaded to Picscaler.

Can I use it for medical decisions?

No. It is an educational aid and does not replace professional medical judgement.