🫁 Ottawa COPD Risk Scale (OCRS)
UseWhen to use: ED disposition decisions for acute COPD exacerbation.
Strata0 low; 1–2 medium; 3–4 high; ≥5 very high — approximate risks from validation table.
LimitsWhen not to use: as the sole admission rule when respiratory failure … · Pitfall: skipping post-treatment reassessment item. · Canadian derivation — calibrate to local admission norms.
SourceGOLD COPD report (tool-page edition); 《慢性阻塞性肺疾病诊治指南》 on zh
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
0–16 points.
When to use
When to use: ED disposition decisions for acute COPD exacerbation.
How it works
Sum 10 items (0–16): CABG 1, PVD intervention 1, prior intubation 2, arrival HR≥110 →2, ischemic ECG 2, CXR congestion 1, Hb<100 3, urea≥12 1, CO₂≥35 1, failed reassess SaO₂/HR 2.
Key points
- 0–16 points.
- Supports disposition discussion.
- Next: GOLD ABE / AECOPD pathway; NIV criteria.
References
- [Guideline / primary source]GOLD COPD report (tool-page edition); 《慢性阻塞性肺疾病诊治指南》 on zh
- Stiell IG, et al. CMAJ 2018 (OCRS validation)
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.
| History of CABG | No (0) |
|---|---|
| History of intervention for PVD | No (0) |
| History of intubation for respiratory distress | No (0) |
| HR on ED arrival ≥ 110 / min | No (0) |
| ECG acute ischemic changes | No (0) |
| Chest x-ray pulmonary congestion | No (0) |
| Hemoglobin < 100 g/L | No (0) |
| Urea ≥ 12 mmol/L | No (0) |
| Serum CO₂ ≥ 35 mmol/L | No (0) |
| After ED Rx: SaO₂ <90% on room air/usual O₂ OR HR ≥120 | No (0) |
→OCRS0/16
- Category：Low
- Approx. serious-outcome risk：~2.2% (validation table; scores >10 rare)
| History of CABG | Yes (1) |
|---|---|
| History of intervention for PVD | Yes (1) |
| History of intubation for respiratory distress | Yes (2) |
| HR on ED arrival ≥ 110 / min | Yes (2) |
| ECG acute ischemic changes | Yes (2) |
| Chest x-ray pulmonary congestion | Yes (1) |
| Hemoglobin < 100 g/L | Yes (3) |
| Urea ≥ 12 mmol/L | Yes (1) |
| Serum CO₂ ≥ 35 mmol/L | Yes (1) |
| After ED Rx: SaO₂ <90% on room air/usual O₂ OR HR ≥120 | Yes (2) |
→OCRS16/16
- Category：Very high
- Approx. serious-outcome risk：~91.4% (validation table; scores >10 rare)
Verification & sources · governance
FAQ
Frequently asked questions
- Does Ottawa COPD Risk Scale (OCRS) 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 Ottawa COPD Risk Scale (OCRS) calculated in practice? Can you show a worked example?
- Inputs: History of CABG No (0), History of intervention for PVD No (0), History of intubation for respiratory distress No (0), HR on ED arrival ≥ 110 / min No (0), ECG acute ischemic changes No (0), Chest x-ray pulmonary congestion No (0), Hemoglobin < 100 g/L No (0), Urea ≥ 12 mmol/L No (0)… → Result: OCRS 0 /16（Category: Low, Approx. serious-outcome risk: ~2.2% (validation table; scores >10 rare)） Inputs: History of CABG Yes (1), History of intervention for PVD Yes (1), History of intubation for respiratory distress Yes (2), HR on ED arrival ≥ 110 / min Yes (2), ECG acute ischemic changes Yes (2), Chest x-ray pulmonary congestion Yes (1), Hemoglobin < 100 g/L Yes (3), Urea ≥ 12 mmol/L Yes (1)… → Result: OCRS 16 /16（Category: Very high, Approx. serious-outcome risk: ~91.4% (validation table; scores >10 rare)）