Methemoglobinemia is a congenital or acquired blood disorder caused by an abnormal amount of methemoglobin which is a form of hemoglobin. Hemoglobin is the protein in red blood cells (RBCs) ...

THE several rare familial disorders constituting the "congenital methemoglobinemias" arise from either of two kinds of inborn errors of metabolism. One kind, accounting for the hemoglobin-M group, ...

Six American soldiers were evacuated from Vietnam because they became cyanotic while taking antimalarial drugs. Investigations of these and two additional subjects revealed a markedly decreased ...