For people without a history of diabetes, 2-hour postprandial blood glucose 8.4mmol / L belongs to the high, suggesting the existence of impaired glucose tolerance, it is important to intervene in a timely manner, or else it is easy to progress to diabetes; for patients with diabetes, it suggests that blood glucose control is good, generally does not matter, and the risk of developing diabetes complications is relatively low. The normal range of 2-hour postprandial blood glucose should be less than 7.8mmol/L, at 7.8mmol/L~11.1mmol/L for impaired glucose tolerance, more than 11.1mmol/L at the same time when the symptoms of diabetes can be diagnosed as diabetes. Therefore, for people without a history of diabetes, a 2-hour postprandial blood glucose of 8.4 mmol/L suggests that hypoglycemia may exist, but it has not yet reached the diagnostic criteria for diabetes mellitus. It is recommended to improve the relevant examination, timely diet control and exercise therapy, otherwise it is easy to progress to diabetes. For diabetic patients, the goal of glycemic control is generally non-fasting blood glucose does not exceed 10.0mmol/L, so 2 hours after meal blood glucose 8.4mmol/L is glycemic control standard, the risk of diabetic complications is relatively low, you should continue to adhere to glycemic control. It is recommended to go to the hospital when the 2-hour postprandial blood glucose of 8.4mmol/L occurs.