🧂 Fractional Excretion of Chloride (FECl)
UseWhen to use: metabolic alkalosis / volume assessment with paired Cl and creatinine.
StrataLow FECl favors chloride-responsive alkalosis; higher values need diuretic/timing context.
LimitsWhen not to use: recent diuretic without timing note. · Pitfall: mismatched Cr units. · Pair with urine Cl concentration.
SourceStandard FECl teaching formula
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
Paired Cl/Cr.
When to use
When to use: metabolic alkalosis / volume assessment with paired Cl and creatinine.
How it works
FECl%=(UCl×PCr)/(PCl×UCr)×100.
Key points
- Paired Cl/Cr.
- Alkalosis adjunct.
- Next: volume & meds.
References
- Standard FECl teaching formula
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 Cl | 20 mEq/L |
|---|---|
| Plasma Cl | 100 mEq/L |
| Urine creatinine | 80 mg/dL |
| Plasma creatinine | 1.0 mg/dL |
→FECl0.25%
- Cue：<0.5% — low FECl (chloride-responsive alkalosis / volume depletion cue)
Verification & sources · governance
FAQ
Frequently asked questions
- Does Fractional Excretion of Chloride (FECl) 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 Chloride (FECl) calculated in practice? Can you show a worked example?
- Inputs: Urine Cl 20 mEq/L, Plasma Cl 100 mEq/L, Urine creatinine 80 mg/dL, Plasma creatinine 1.0 mg/dL → Result: FECl 0.25 %（Cue: <0.5% — low FECl (chloride-responsive alkalosis / volume depletion cue)）