HACOR Score (NIV failure)
HACOR score (Duan 2017) predicting non-invasive-ventilation failure: heart rate, arterial pH, GCS, the PaO2/FiO2 ratio, and respiratory rate each banded; a total > 5 at 1 hour marks the high-risk band.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Heart rate
- 110 bpm
- Arterial pH
- 7.40
- Glasgow Coma Scale
- 15
- PaO2
- 120 mmHg
- FiO2
- 0.5
- Respiratory rate
- 25 breaths/min
Result: HACOR 0: not in the Duan 2017 high-risk band (cutoff >5).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0-5
- Not in the Duan 2017 NIV-failure high-risk band.
- >5
- High risk of NIV failure at 1 hour per Duan 2017 (cutoff >5; specificity ~90%).
What you enter
- Heart rate
- Arterial pH
- Glasgow Coma Scale (3-15)
- PaO2
- FiO2 (0-1)
- Respiratory rate
How this is calculated
Duan J, Han X, Bai L, Zhou L, Huang S. Assessment of heart rate, acidosis, consciousness, oxygenation, and respiratory rate to predict noninvasive ventilation failure in hypoxemic patients. Intensive Care Med. 2017;43(2):192-199. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.