Warm autoimmune hemolytic anemia

Warm Antibody Autoimmune Hemolytic Anemia (WAIHA) is the most common of the autoimmune hemolytic diseases. About half of the cases are idiopathic, with the other half attributable to a predisposing condition or medications being taken. Contrary to cold autoimmune hemolytic anemia (e.g. cold agglutinin disease and paroxysmal cold hemoglobinuria) which happens in cold temperature (28-31°C), WAIHA happens in body temperature.