Check blood sugar can hang up the endocrinology department, before checking blood sugar must be fasting, don’t eat anything, if fasting blood sugar is high, it is recommended to do glucose tolerance test and insulin release test, take venous fasting blood sugar as well as 75 grams of glucose tolerance after two hours of blood sugar, glycated hemoglobin, urinalysis and so on. If the fasting blood sugar is greater than or equal to 7mmol/L, two hours after meal blood sugar is greater than or equal to 11.1mmol/L, it is called diabetes mellitus, diabetes mellitus patients usually glycated hemoglobin will be more than 6.5%, and some patients will have a positive urine sugar. The incidence of diabetes is increasing, with the improvement of living standards and people’s diet increase, exercise is closely related to the decrease, so if you have elevated blood glucose, or want to prevent diabetes patients, you need to control the diet to limit the total number of calories per day to eat, while increasing the amount of exercise, increase the consumption of calories.