Table 1 Symptoms of carbon monoxide poisoning depending on the level of carboxyhemoglobin in the blood
Carboxyhemoglobin (%) | Symptom |
|---|---|
<  5 | No symptoms |
5–10 | Visual impairments |
10–20 | Headaches, palpitations, dyspnea |
20–30 | Worsening of symptoms |
30–40 | Somnolence, unconsciousness |
40–60 | Coma |
>  60 | Death |