A platelet distribution width of 9.2 is in the low range, and the severity should be determined in conjunction with other tests. If it is aplastic anemia caused by platelet distribution decrease is more serious. Under normal circumstances, the range of platelet distribution width is 15.5~18.1, when the platelet distribution width is reduced, it suggests the possibility of thrombocytopenia. 1. Aplastic anemia: this is a more serious disease, if left untreated, the number of platelets will become less and less, affecting the patient’s life safety. 2. Megaloblastic anemia: the thrombocytopenia caused by this kind of disease is not particularly serious, usually after supplementing folic acid and vitamin B₁₂ the symptoms of thrombocytopenia will be relieved. 3. Primary immune thrombocytopenic purpura: the severity of this type of disease is mainly related to the degree of platelet reduction, the lower the platelets, the greater the risk of bleeding, and then the more serious the condition. There may be other reasons for the decrease in platelet distribution width, such as leukemia, myelofibrosis, radiation damage, etc. When there is a decrease in platelet distribution width, it is recommended to go to the hematology department, complete the relevant examinations, and then take effective and comprehensive therapeutic measures after the doctor combines with the relevant clinical symptoms and clarifies the cause of the disease.