Blood glucose is the concentration of glucose in the blood, and the normal value for fasting blood glucose is 3.9-6.0 mmol/L. When the fasting blood glucose is between 6.0-7.0 mmol/L, the fasting blood glucose is too high. When fasting blood glucose is greater than 7.0 mmol/L, diabetes may be present and will need to be reviewed at another time to confirm. Two-hour postprandial blood glucose is measured from the first bite of the meal, and the normal value of two-hour postprandial blood glucose is less than 7.8 mmol/L. When the two-hour postprandial blood glucose is between 7.8-11.1 mmol/L, it is considered to be abnormal glucose tolerance. When the two-hour postprandial blood glucose is greater than 11.1 mmol/L, diabetes may be present, and another blood glucose review at a different time is also needed. High fasting blood glucose and abnormal glucose tolerance belong to the same stage of impaired regulation, which is pre-diabetes. Whenever fasting or postprandial blood glucose exceeds normal values, diabetes should be treated with diet and exercise, and blood glucose should be monitored regularly. If your blood sugar still fails to reach the standard after diet and exercise, you need to take oral hypoglycemic drugs or insulin therapy under the guidance of your doctor.