The absolute value of reticulocytes is (24-84)×10^9/L. Reticulocytes refer to late juvenile erythrocytes that have not fully matured after the nucleus has been removed, and are named because of the presence of basophilic substances such as ribosomes in the cytoplasm, which show a reticulocytic structure after staining. Reticulocytosis often indicates a strong proliferation of the red lineage in the bone marrow, and is commonly seen after hemolytic anemia or acute blood loss, when the number of erythrocytes in the peripheral blood decreases and the reticulocytes in the bone marrow that have not yet fully matured are released early, causing an increase in the number of reticulocytes. Also, in patients with iron deficiency anemia and megaloblastic anemia, the number of reticulocytes may increase significantly after iron supplementation or folic acid or vitamin B12 supplementation. Reticulocyte reduction is common in cases of low bone marrow hematopoiesis, the most common disease being aplastic anemia, and in leukemia patients after chemotherapy.