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🦴 Fractional Excretion of Calcium (FECa)

UseWhen to use: hypercalcemia phenotyping (FHH vs PTH-driven) adjunct.

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StrataVery low FECa can support FHH-leaning cues; higher FECa supports renal calcium leak.

LimitsWhen not to use: thiazide/Li without caveat. · Pitfall: total Ca without albumin context. · Thresholds vary.

SourceStandard FECa arithmetic

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.

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Methodology · worked example, guidelines & full notes
Clinical takeaway

Spot FECa.

When to use

When to use: hypercalcemia phenotyping (FHH vs PTH-driven) adjunct.

How it works

FECa = (UCa × PCr)/(PCa × UCr) × 100%.

Key points

  • Spot FECa.
  • Hypercalcemia adjunct.
  • Next: PTH / genetics as indicated.

References

  • Standard FECa arithmetic

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 calcium8 mg/dL
Plasma calcium9.5 mg/dL
Plasma creatinine1.0 mg/dL
Urine creatinine100 mg/dL

→FECa0.84%

  • Cue：<1% — low FECa (conservation / FHH-leaning cue with hypercalcemia context)
Verification & sources · governance
FAQ

Frequently asked questions

Does Fractional Excretion of Calcium (FECa) 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 Calcium (FECa) calculated in practice? Can you show a worked example?
Inputs: Urine calcium 8 mg/dL, Plasma calcium 9.5 mg/dL, Plasma creatinine 1.0 mg/dL, Urine creatinine 100 mg/dL → Result: FECa 0.84 %（Cue: <1% — low FECa (conservation / FHH-leaning cue with hypercalcemia context)）
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