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💧 Fractional Excretion of Uric Acid (FEUA)

UseWhen to use: hyponatremia workups with paired urine/plasma urate and creatinine.

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StrataHigher FEUA (~>11–12%) favors SIADH-type; low (<4%) favors hypovolemia bands.

LimitsWhen not to use: on uricosurics / advanced CKD without context. · Pitfall: mismatched units. · Combine with exam, FeNa, cortisol/TSH.

SourceFEUA hyponatremia teaching cutoffs

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.

Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.

Methodology · worked example, guidelines & full notes
Clinical takeaway

Percent FEUA.

When to use

When to use: hyponatremia workups with paired urine/plasma urate and creatinine.

How it works

FEUA%=(UUA×PCr)/(PUA×UCr)×100.

Key points

  • Percent FEUA.
  • SIADH adjunct.
  • Next: volume diagnosis.

References

  • FEUA hyponatremia teaching cutoffs

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 uric acid40 mg/dL
Plasma uric acid4 mg/dL
Urine creatinine80 mg/dL
Plasma creatinine1.0 mg/dL

→FEUA12.5%

  • Cue：>11–12% — favors SIADH / renal urate wasting band in hyponatremia workups
Verification & sources · governance
FAQ

Frequently asked questions

Does Fractional Excretion of Uric Acid (FEUA) 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 Uric Acid (FEUA) calculated in practice? Can you show a worked example?
Inputs: Urine uric acid 40 mg/dL, Plasma uric acid 4 mg/dL, Urine creatinine 80 mg/dL, Plasma creatinine 1.0 mg/dL → Result: FEUA 12.5 %（Cue: >11–12% — favors SIADH / renal urate wasting band in hyponatremia workups）
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