Reticulocytopenia is a medical term that refers to a lower than normal amount of immature red blood cells, called reticulocytes, in the blood. Synonyms for this condition include hyporegenerative anemia, hypoplastic anemia, and erythrocyte aplasia. These terms all refer to a decrease in the body's ability to produce new red blood cells, resulting in a reduction in the number of red blood cells in circulation. Other related conditions that may be used as synonyms for reticulocytopenia include aplastic anemia and myelodysplastic syndromes. Treatment for reticulocytopenia typically involves identifying and addressing the underlying cause, such as a nutritional deficiency or an autoimmune disorder.