Low platelet distribution width alone is not harmful and can be followed up regularly. Platelet distribution width is the difference in platelet size, the normal value is 15%-17%, platelet distribution width is low represents the platelet size uniformity is good, there is no harm, regular follow-up observation can be. If the width of platelet distribution is high, it means the platelet size is not uniform, which is common in acute myeloid leukemia, megaloblastic anemia, chronic granulocytic leukemia, splenectomy and other diseases. Platelets are an important component of blood, with the functions of adhesion, aggregation, release, contraction, etc., and their main function is to stop bleeding. Clinically, platelet function is mainly judged according to platelet count, average platelet volume, platelet pressure, platelet distribution width, and the proportion of large platelets. Low platelet distribution width is not harmful, and it is recommended that timely follow-up combined with other routine blood indicators to determine whether there is any abnormality.