An inherited blood disorder that is characterized by increased levels of an abnormal form of haemoglobin in the blood stream, results in  the presence of a higher than normal level of methemoglobin (metHb) in the blood.

Methemoglobin is a form of hemoglobin that does not bind oxygen.

When its concentration is elevated in red blood cells, tissue hypoxia can occur, as methemoglobinemia cannot bind and carry oxygen effectively.



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