Blood sugar includes fasting blood sugar and postprandial blood sugar, the details are as follows: 1. Fasting blood sugar > 7.0mmol/L can be diagnosed as diabetes, if the test is accurate, blood sugar reaches 7.1mmol/L, consider the diagnosis of diabetes; 2. 2 hours postprandial blood sugar is more meaningful for Chinese people to test, most Chinese people like to eat carbohydrates, which is the main cause of the increase of postprandial blood sugar Some diabetic patients’ fasting blood sugar does not reach 7.0mmol/L, but the blood sugar of 2 hours after meal exceeds 11.1mmol/L also belongs to diabetes.