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Physiological indications for long-term oxygen therapy (LTOT) BTS Guidelines
| Pa,O2 kPa | Sa,O2 % | LTOT indication | Qualifying condition |
| ≤7.3 | ≤88 | Absolute | None |
| 7.3-8 | 89 | Relative with qualifier | “P” pulmonale, polycythemia >55% History of oedema |
| ≥8 | ≥90 | None except with qualifier | Exercise desaturation Sleep desaturation not corrected by CPAP Lung disease with severe dyspnoea responding to O2 |
