Difference between alveolar and arterial oxygen tension — assesses the cause of hypoxaemia (gas-exchange defect vs hypoventilation).
| Field | Unit | Notes |
|---|---|---|
| FiO₂ | — | Fraction, 0.21 (room air) to 1.0 |
| PaCO₂ | mmHg | 5–150 |
| PaO₂ | mmHg | 20–700 |
| Atmospheric pressure (optional) | mmHg | Default 760 (sea level) |
Difference between alveolar and arterial oxygen tension — assesses the cause of hypoxaemia (gas-exchange defect vs hypoventilation).
FiO₂, PaCO₂ (mmHg), PaO₂ (mmHg), Atmospheric pressure (optional) (mmHg).
Most accurate on room air. Uses respiratory quotient 0.8; the gradient widens normally with higher FiO₂.
Oxygenation Index for severity stratification of paediatric ARDS (PARDS).
Severity assessment of an acute paediatric asthma exacerbation from respiratory rate plus four clinical signs (5–15).
Three-item bedside score (0–6) for grading acute asthma severity in children from wheezing, work of breathing, and prolonged expiration.
Grades croup severity from five clinical signs (0–17) to guide treatment and disposition.
Non-invasive oxygenation severity index (uses SpO₂ instead of PaO₂) for grading pediatric ARDS (PALICC).
Validated acute asthma severity score from five signs (0–12).
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