A 3-hour postprandial blood glucose of 6.7 mmol/L may be on the high side. Generally, 3-hour postprandial blood glucose level will return to the fasting blood glucose level, i.e. 3.9~6.1mmol/L. However, 3-hour postprandial blood glucose is not used as a diagnostic criterion for diabetes mellitus, and it is mostly recognized as random blood glucose. In clinical practice, the three-hour postprandial blood glucose concentration is usually not tested, usually tested fasting blood glucose, two hours after meals blood glucose concentration, so if there is an abnormality in the three-hour postprandial blood glucose concentration, it is recommended to improve the fasting blood glucose, two hours after meals blood glucose test to determine whether the blood glucose level is normal or not. It is recommended to go to the hospital for medical consultation when abnormal three-hour postprandial blood glucose value occurs, and it is not advisable to take medication on your own.