Also called Reticulocytopenia: abnormal decrease of reticulocytes in the body
Clinically common in Sickle cell<unk>  and Hereditary Spherocytosis (HS)
Aplastic crisis
Tumor lysis syndrome
Sickle cell crisis
Immune reconstitution syndrome
Acute transfusion reaction
Leukemia 
Leukemia
Acute myeloid leukemia