Causes of raised COHb levels by diagnosis
| Carboxyhaemoglobin (%) | ||||
|---|---|---|---|---|
| Total | 2–2.5% | 2.5–4.5% | >4.5% | |
| COPD | 8 | 1 | 1 | 6 |
| Cardiac | 5 | 1 | 3 | 1 |
| Drug/alcohol poisoning | 11 | 2 | 4 | 5 |
| Sepsis | 3 | 1 | 1 | 1 |
| Acute abdomen | 3 | 1 | 2 | 0 |
| Haemoptysis ? lung cancer | 2 | 0 | 1 | 1 |
| Diabetic | 2 | 1 | 1 | 0 |
| Others | 8 | 2 | 5 | 1 |
| Total | 42 | 9 | 18 | 15 |