The normal range of fasting blood glucose is 3.9~6.1mmol/L, and the normal range of blood glucose two hours after meal is less than 7.8mmol/L. Fasting blood glucose requires a blood glucose concentration measured in a state of at least 8~10 hours without food, and the normal range of fasting blood glucose is 3.9~6.1mmol/L. If the fasting blood glucose is greater than or equal to 6.1mmol/L but less than 7.0mmol/L, and the 2-hour post glycemic load blood glucose is less than 7.8mmol/L, it suggests that the fasting blood glucose is impaired. Fasting blood glucose greater than or equal to 7.0 mmol/L with typical diabetic symptoms meets the diagnostic criteria for diabetes. Two-hour postprandial blood glucose refers to the concentration of blood glucose measured over the past two hours from the first bite of food, the normal two-hour postprandial range should be less than 7.8mmol/L. If the two-hour postprandial blood glucose is greater than or equal to 11.1mmol/L with typical diabetic symptoms, the diagnostic criterion of diabetes mellitus has been reached. It is recommended that you seek medical attention if you have abnormal blood glucose levels.