A chemical complex of the pigment portion of hemoglobin (heme) with the plasma protein albumin. It is formed in the blood in anemias in which red blood cells are destroyed and free hemoglobin is released into the plasma. In such conditions methemalbumin can be detected in both the blood and urine.
The abnormal combination of heme with albumin instead of globulin. It is present in blackwater fever (malaria complicated by massive hemolysis) and paroxysmal nocturnal hemoglobinuria.