The purpose of reticulocyte test is to clarify the hematopoietic function of bone marrow. Reticulocytes are the immature stage of red blood cells. Reticulocyte test is an important indicator to reflect the hematopoietic function of the bone marrow as well as to determine the efficacy of anemia and related diseases. Increased reticulocytes indicate that the bone marrow has strong hematopoietic function, which is common in various proliferative anemias, such as iron-deficiency anemia, megaloblastic anemia, hemorrhagic anemia; decreased reticulocytes indicate that the bone marrow has low hematopoietic function, which is common in aplastic anemia, megaloblastic anemia, acute leukemia and so on. In addition, reticulocyte test can also provide a reference index to determine the efficacy of treatment for patients with hemolytic and hemorrhagic anemia. If the reticulocytes decrease after treatment, it means that the hemolytic or hemorrhagic condition has been effectively controlled; if the reticulocytes increase instead of decreasing after treatment, it means that the condition has not been effectively controlled, and it may even become more serious. If the test result is abnormal, you should consult a doctor in time.