Postprandial blood glucose needs to specify how long after a meal it is, whether it is 1 hour or 2 hours after a meal, 4.8mmol/L is generally a normal value. In the normal population, a blood glucose of less than 7.8mmol/L two hours after a meal is normal, and a blood glucose of 11.1mmol/L or more will assist in the diagnosis of diabetes mellitus. Blood glucose testing two hours after a meal is a common standard for determining blood glucose levels. If the postprandial blood glucose is within the range of 7.8~11.1mmol/L and the fasting blood glucose is normal, you need to consider impaired glucose tolerance, which is generally pre-diabetic, whereas blood glucose values of 11.1mmol/L or more need to be considered as diabetic. If the postprandial blood glucose test is abnormal, it is necessary to consult a doctor in time to clarify the cause and standardize the treatment.