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RAS, respiratory assessment scoring; b/m, breaths/minute; A-a Gradient, alveolar-arterial oxygen gradient.
| Points | |
| Respiratory rate (b/m) | |
| ≤20 | 1 |
| 21-25 | 2 |
| 26-30 | 3 |
| >30 | 4 |
| Resting oxygen saturation (%) | |
| ≥95 | 1 |
| 90-94 | 2 |
| <90 | 3 |
| A-a Gradient | |
| Normal | 1 |
| Elevated | 3 |
