High mean platelet volume means that the mean platelet volume exceeds the normal value, generally the normal value of clinical mean platelet volume is 7~11fl. Increased indexes are seen in hematologic diseases, hematopoietic function recovery, etc. It is recommended to consult a specialist. 1. Increased mean platelet volume is commonly seen in primary thrombocythemia, giant platelet syndrome, thrombophilia, but also in myelofibrosis, chronic granulocytic leukemia and so on. 2. Transient high platelet volume may also occur due to the recovery of hematopoietic function after the end of chemotherapy and the end of myelosuppressive period in tumor patients, which can be monitored regularly. Mean platelet volume is one of the indicators of routine blood tests, which indicates the average volume of individual platelets and can reflect the size of platelet volume, and can also be used to determine bleeding tendency, changes in bone marrow hematopoietic function, as well as diagnosis and treatment of certain blood system diseases. If you need to check the blood routine, generally do not need to fasting, but need to pay attention to a light diet. Clinically, patients with bleeding tendency and hematopoietic abnormality need to be examined for mean platelet volume. If the average platelet volume is elevated, it is recommended to consult the doctor in time to clarify the cause and receive standardized treatment under the guidance of the doctor.