Version May 2024
| CO-Hb, % | Signs and symptoms |
| 0-10 | None |
| 10-20 | Tightness across forehead, slight headache, dilation of the cutaneous blood vessels |
| 20-30 | Headache and throbbing in the temples |
| 30-40 | Severe headache, weakness, dizziness, dimness of vision, nausea, vomiting, collapse |
| 40-50 | Same as above, greater possibility of collapse; syncope, increased pulse and respiratory rates |
| 50-60 | Syncope, increased respiratory and pulse rates, coma, intermittent convulsions, Cheyne-Stokes respiration |
| 60-70 | Coma, intermittent convulsions, depressed heart action and respiratory rate, possible death |
| 70-80 | Weak pulse, slow respiration leading to death within hours |
| 80-90 | Death in less than 1 hour |
| >90 | Death within minutes |
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