HACOR Score (NIV Failure Prediction) — free guideline decision tool
Predict non-invasive ventilation failure with the HACOR score.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
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.
| Heart rate | ≤ 120 (0) |
|---|---|
| Arterial pH | ≥ 7.35 (0) |
| GCS | 15 (0) |
| PaO₂/FiO₂ | ≥ 201 (0) |
| Respiratory rate | ≤ 30 (0) |
→HACOR0
- Interpretation：≤ 5 — lower risk of failure
- Action：NIV likely to succeed; reassess frequently.
| Heart rate | ≥ 121 (1) |
|---|---|
| Arterial pH | < 7.25 (4) |
| GCS | ≤ 10 (10) |
| PaO₂/FiO₂ | ≤ 100 (6) |
| Respiratory rate | ≥ 46 (4) |
→HACOR25
- Interpretation：> 5 at 1 h — high risk of NIV failure
- Action：Consider early intubation; delayed intubation after NIV failure increases mortality.
Common questions
What is HACOR Score (NIV Failure Prediction)?
Predict non-invasive ventilation failure with the HACOR score.
How is HACOR Score (NIV Failure Prediction) calculated? What is the core formula?
Heart rate, Acidosis (pH), Consciousness (GCS), Oxygenation (PaO₂/FiO₂) and Respiratory rate. Measured ~1 h into NIV; > 5 = high risk.
When is HACOR Score (NIV Failure Prediction) used?
Identify patients who may benefit from early intubation.
What are the key clinical points for HACOR Score (NIV Failure Prediction)?
Assessed about one hour after starting NIV. > 5 indicates high probability of failure. Delayed intubation after NIV failure increases mortality.
What are the limits and cautions when using HACOR Score (NIV Failure Prediction)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
How is HACOR Score (NIV Failure Prediction) calculated in practice? Can you show a worked example?
Inputs: Heart rate ≤ 120 (0), Arterial pH ≥ 7.35 (0), GCS 15 (0), PaO₂/FiO₂ ≥ 201 (0), Respiratory rate ≤ 30 (0) → Result: HACOR 0（Interpretation: ≤ 5 — lower risk of failure, Action: NIV likely to succeed; reassess frequently.） Inputs: Heart rate ≥ 121 (1), Arterial pH < 7.25 (4), GCS ≤ 10 (10), PaO₂/FiO₂ ≤ 100 (6), Respiratory rate ≥ 46 (4) → Result: HACOR 25（Interpretation: > 5 at 1 h — high risk of NIV failure, Action: Consider early intubation; delayed intubation after NIV failure increases mortality.）
Run HACOR Score (NIV Failure Prediction) now
Predict non-invasive ventilation failure with the HACOR score.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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