Platelet distribution width of 12.4 is normal. The normal value of platelet distribution width is 9% to 17% and platelet distribution width of 12.4% is within the normal range. Platelet distribution width, also known as platelet volume distribution width, is a parameter that mainly reflects the variation of platelet volume in the blood. A platelet distribution width of 12.4% indicates a high degree of platelet volume homogeneity and a relatively even size. If it is high, it means that the platelet volume is unevenly distributed, which is common in leukemia, chronic granulocytic leukemia, megaloblastic anemia and other diseases. A platelet distribution width outside the normal range also reflects an increased rate of platelet production. A platelet distribution width value of 12.4% is considered normal. If abnormal platelet distribution width is found, it is recommended to go to the hospital in time to improve the examination and give targeted treatment under the guidance of the doctor after the cause of the disease is clarified.