Aplastic anemia is a rare disorder characterized by pancytopenia and a hypo cellular bone marrow.This causes a deficiency of all three blood cell types (pancytopenia): red blood cells (anemia), white blood cells (leukopenia), and platelets (thrombocytopenia) . The clinical consequences are anemia, usually with a requirement for frequent red blood cell transfusions, life-threatening bleeding from thrombocytopenia, and infection because of neutropenia. Bacterial and fungal infections are most common and are a significant cause of morbidity and mortality.