The average platelet volume of 8.9fl is a little low, but not very serious, generally do not worry, can be a physiological phenomenon. Common causes of pathologically low platelet volume include bone marrow hematopoietic disorders. Bone marrow hematopoietic function is reduced, resulting in platelet generation disorder, thus causing low platelet volume, which can be seen in AIDS, aplastic anemia, acute leukemia and so on. Drugs can be used for treatment, such as cyclosporine, stanozolol and other drugs as prescribed by the doctor for aplastic anemia. If the average platelet volume is persistently low, it is necessary to consult a doctor in time and receive treatment under the guidance of a physician to avoid delaying the condition.