During the physiological period, platelets will not be elevated if blood is drawn for checking, because after all, menstruation is a normal physiological phenomenon, which will not lead to platelet elevation, but we should pay attention to the following points: 1. If blood is drawn for checking platelets in the morning, a very small portion of people will have the symptom of platelet bias low, and then blood drawn for checking in the afternoon, platelet bias high may occur, and it will be higher than in winter in the spring. 2. If the platelets are checked in the afternoon, it is suggested that it is best to do the test again in the morning to see if the platelets are lower than before. If the platelets are lower than before and within the normal range, it is a normal physiological reaction and there is no need to be nervous. In addition, the menstrual period will not affect the blood accordingly.