Approximate relationship between SaO2 and PaO2
| Oxygen tension PaO2 (kPa) | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | ≥17 |
| Oxygen tension PaO2 (mm Hg) | 30 | 37.5 | 45 | 52.5 | 60 | 67.5 | 75 | 82.5 | 90 | 97.5 | 104 | 112.5 | 120 | ≥127.5 |
| Oxygen saturation SaO2 (%) | 57.4 | 71.4 | 80.7 | 86.8 | 90.7 | 93.2 | 94.9 | 96.2 | 97.0 | 97.8 | 98.2 | 98.6 | 98.8 | ≥99.0 |
PaO2, arterial oxygen tension; SaO2, arterial oxygen saturation.