HP and anemia: AIHA is characterized by the presence of anemia (hemoglobin less than 12g/dl in males and 11g/dl in females) associated with a reticulocyte count >120 000/mm3 and indicators of hemolysis such as an increase in lactate dehydrogenase (LDH), a decrease in haptoglobin and an increase in indirect bilirubin (IB).