🦴 Janssens Acute Gout Diagnosis Rule
UseWhen to use: acute monoarthritis when aspiration is delayed or unavailable.
Strata≤4 unlikely; 4–<8 aspirate if feasible; ≥8 gout likely.
LimitsWhen not to use: ignoring possible septic arthritis. · Pitfall: UA can be normal in flare. · Not a sole crystal diagnosis.
SourceJanssens acute gout diagnostic rule
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
Seven weighted items.
When to use
When to use: acute monoarthritis when aspiration is delayed or unavailable.
How it works
Male +2, prior attack +2, onset ≤1 d +0.5, redness +1, 1st MTP +2.5, HTN/CVD +1.5, UA >5.88 +3.5.
Key points
- Seven weighted items.
- Bands ≤4 / mid / ≥8.
- Next: aspirate or empiric gout Rx.
References
- Janssens acute gout diagnostic rule
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.
| Male sex | No (0) |
|---|---|
| Previous patient-reported arthritis attack | No (0) |
| Onset within 1 day | No (0) |
| Joint redness | No (0) |
| 1st MTP joint involvement | No (0) |
| Hypertension or ≥1 CVD (angina/MI/CHF/stroke/TIA/PVD) | No (0) |
| Serum uric acid >5.88 mg/dL (0.35 mmol/L) | No (0) |
→Gout rule0.0/13
- Probability band：≤4 — gout unlikely (high NPV); consider septic/crystal mimics
| Male sex | Yes (+2) |
|---|---|
| Previous patient-reported arthritis attack | Yes (+2) |
| Onset within 1 day | Yes (+0.5) |
| Joint redness | Yes (+1) |
| 1st MTP joint involvement | Yes (+2.5) |
| Hypertension or ≥1 CVD (angina/MI/CHF/stroke/TIA/PVD) | Yes (+1.5) |
| Serum uric acid >5.88 mg/dL (0.35 mmol/L) | Yes (+3.5) |
→Gout rule13.0/13
- Probability band：≥8 — gout likely; empiric gout therapy often reasonable if infection unlikely
Verification & sources · governance
FAQ
Frequently asked questions
- Does Janssens Acute Gout Diagnosis Rule 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 Janssens Acute Gout Diagnosis Rule calculated in practice? Can you show a worked example?
- Inputs: Male sex No (0), Previous patient-reported arthritis attack No (0), Onset within 1 day No (0), Joint redness No (0), 1st MTP joint involvement No (0), Hypertension or ≥1 CVD (angina/MI/CHF/stroke/TIA/PVD) No (0), Serum uric acid >5.88 mg/dL (0.35 mmol/L) No (0) → Result: Gout rule 0.0 /13（Probability band: ≤4 — gout unlikely (high NPV); consider septic/crystal mimics） Inputs: Male sex Yes (+2), Previous patient-reported arthritis attack Yes (+2), Onset within 1 day Yes (+0.5), Joint redness Yes (+1), 1st MTP joint involvement Yes (+2.5), Hypertension or ≥1 CVD (angina/MI/CHF/stroke/TIA/PVD) Yes (+1.5), Serum uric acid >5.88 mg/dL (0.35 mmol/L) Yes (+3.5) → Result: Gout rule 13.0 /13（Probability band: ≥8 — gout likely; empiric gout therapy often reasonable if infection unlikely）