In general, a 2-hour postprandial blood glucose of less than 7.8 mmol/L is considered normal. For diabetic patients it is generally controlled below 10.0 mmol/L. Two hours after meal blood glucose less than 7.8mmol / L is normal, 7.8 ~ 11.0mmol / L for impaired glucose tolerance, ≥ 11.1mmol / L at the same time when the symptoms of diabetes can be diagnosed as diabetes. For diabetic patients, the goal of glycemic control is generally non-fasting blood glucose does not exceed 10.0mmol/L, but also need to set the glycemic control goal according to individual circumstances. For pregnant women, normal 2-hour postprandial glucose should be less than 8.5mmol/L. People with abnormal 2-hour postprandial blood glucose are advised to go to the hospital for a complete examination to determine whether they have diabetes.