The normal standard for two-hour postprandial blood glucose in normal people is <7.8mmol/L. Two-hour postprandial blood glucose is a type of glucose tolerance test, which can be used to judge the ability of pancreatic β-cells to secrete insulin after eating, i.e. the reserve function of pancreatic β-cells. During the glucose tolerance test, the normal value of two-hour postprandial blood glucose is <7.8 mmol/L. Hypoglycemia is a two-hour postprandial blood glucose ranging from 7.8 to 11.0 mmol/L, and diabetes mellitus can be diagnosed when the two-hour postprandial blood glucose is ≥11.1 mmol/L. However, diabetes mellitus cannot be diagnosed by the glucose tolerance test. However, for the diagnosis of diabetes mellitus, we cannot only focus on the two-hour postprandial blood glucose, but also need to combine the fasting blood glucose and glycated hemoglobin values. Some patients may have a normal 2-hour glucose, but have elevated fasting glucose and glycosylated hemoglobin levels to confirm the diagnosis of diabetes. If the patient is found to exist two hours after meal blood glucose elevation, more than the normal standard, should immediately consult a doctor, improve the relevant examination, such as fasting blood glucose, glycated hemoglobin, urine glucose measurement, etc., and comply with the doctor's instructions to take medication, do not take medication treatment.