Methemoglobin (MetHb, Hb M) is a structural hemoglobin (Hb) variant, which is formed when the heme portion of deoxygenated Hb is oxidized to a ferric state. When this occurs, the heme is incapable of combining with oxygen and transporting it to the tissues, and the patient becomes cyanotic.
Procedure and posttest care
Normal Met Hb levels are 0% to 1.5% of total Hb.
Increased MetHb levels may indicate acquired or hereditary methemoglobinemia, or carbon monoxide poisoning. These levels can also be caused by use of certain drugs or exposure to certain substances.
Decreased MetHb levels may occur in pancreatitis.
The information provided on this web site should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. We will not be liable for any complications, or other medical accidents arising from the use of any information on this web site.