| Pao2 (kPa) | Sao2 (%) | |
| Normal (range) | 13 (⩾10.7) | 97 (95-100) |
| Hypoxaemia | <10.7 | <95 |
| Mild hypoxaemia | 8-10.5 | 90-94 |
| Moderate hypoxaemia | 5.3-7.9 | 75-89 |
| Severe hypoxaemia | <5.3 | <75 |
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