There is no such thing as when is the most accurate time to measure blood glucose. Different blood glucose measurement methods have different measurement times. At present, there are fasting blood glucose, random blood glucose, 2 hours after meal blood glucose, etc. According to the different ways of measurement, generally need to measure blood glucose at about 7:00 a.m., 2 hours after meal, or any time. 1. Fasting blood glucose: It can assess the situation of glucose metabolism disorder, and it is generally recommended to fast for more than 8 hours, and test the fasting blood glucose at about 7:00 a.m. the next day, and the normal value of fasting blood glucose is 3.9-6.1mmol/L. 2; 2. 2-hour postprandial blood glucose: can better reflect the meal calories and medication dose control of blood glucose, generally from the first meal of three meals to start timing, to 2 hours after the measurement of blood glucose, 2-hour postprandial blood glucose is less than 7.8mmol / L, more ideal. 3. Random blood glucose: it can reflect the function of pancreatic β-cells, generally at an unlimited time, measured blood glucose, such as before going to bed, before meals, etc., generally less than 11.1mmol/L. When there are many times of abnormal blood glucose, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, and carry out targeted treatment or therapy with the help of the doctor.