Postprandial blood glucose mainly refers to 2 hours after meal blood glucose, normal people postprandial blood glucose 8.4mmol/l is higher than the range of normal values, but has not reached the diagnostic criteria for diabetes, should be further examination. For normal people require 2 hours after meal blood glucose is lower than 7.8mmol/l, after meal blood glucose 8.4mmol/l is slightly higher than the upper limit of normal value, but has not reached the diagnostic standard of diabetes. It is possible that you may have eaten too much or foods with high sugar content, or you may have impaired glucose tolerance. Therefore, it is recommended to pay extra attention to daily diet, eat small and frequent meals, strictly control the total calories and sugar content; and insist on exercise. If diet and exercise still can’t control blood glucose at normal level, patients should go to the hospital in time to complete the glucose tolerance test. If the patient has obvious elevation of blood glucose, he/she should go to the hospital in time for further examination.