The platelet distribution width is an indicator of platelet volume size dispersion and is expressed as the coefficient of variation of the measured individual platelet size. A smaller platelet distribution width indicates a high homogeneity of platelets, which is a normal phenomenon, while a larger distribution width indicates a disparity in platelet size, which may be related to some blood system diseases or thrombotic diseases. It should be considered in combination with other indicators in blood routine such as red blood cell, white blood cell, platelet count, hemoglobin value, etc., and also in combination with coagulation six items, thromboelastography and other tests to exclude various unfavorable factors, if there is anemia, you can rest, take some blood granules, increase nutrition, etc.