Methemoglobins are formed when there is an error in normal hemoglobin formation, which results in high amounts of hemoglobin binding with iron. Methemoglobin is unable to bind with oxygen for transport to the tissues of the body. Methemoglobin formation in adults is usually a result of carbon monoxide poisoning, diet, medication, or other environmental factors and can be easily treated. Infants born with an inherited hemoglobin abnormality which causes the formation of methemoglobin have a very poor prognosis.
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