Blood Concentrations and Symptoms of Carbon Monoxide Poisoning

Clinical symptoms at different concentrations of carboxyhemoglobin in the blood

Adapted from Gilman AG (2002). Goodman and Gilman's The Pharmacological Basis of Therapeutics, 10th ed., p. 1881. New York: McGraw-Hill.

Numbers show the amount of hemoglobin that has bonded with carbon monoxide. This number is also called the carboxyhemoglobin level.

Current as of: May 27, 2020

Author: Healthwise Staff
Medical Review:
Anne C. Poinier MD - Internal Medicine
Brian D. O'Brien MD - Internal Medicine
Kathleen Romito MD - Family Medicine
Adam Husney MD - Family Medicine
R. Steven Tharratt MD, MPVM, FACP, FCCP - Pulmonology, Critical Care Medicine, Medical Toxicology

Is it an emergency?

If you or someone in your care has chest pains, difficulty breathing, or severe bleeding, it could be a life-threatening emergency. Call 9-1-1 or the local emergency number immediately.
If you are concerned about a possible poisoning or exposure to a toxic substance, call Poison Control now at 1-800-567-8911.

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