The 2 hours postprandial blood sugar 8.1mmol/L is abnormal for the general population, normal for women during pregnancy, and good blood sugar control for diabetic patients. There are differences in the criteria for judging different groups of people: 1. General population: For the general population without disease, the 2 hours postprandial blood sugar value should be <7.8mmol/L, generally at 4.4-7.8mmol/L. If the blood sugar of 2 hours after meal reaches 8.1mmol/L, it belongs to abnormal state, but it does not reach the diagnosis standard of diabetes, it belongs to abnormal glucose tolerance, it is the early manifestation of diabetes, attention should be paid to sugar control and treatment, about 8-10% of patients can turn into diabetes in the following year; 2. Diabetic population: If the blood sugar of 2 hours after meal reaches 8.1mmol/L for diabetic patients It belongs to the stage of good control. If it is a young person, the requirement can be lower, and the 2-hour postprandial blood glucose can be controlled at 7.5-8.0 mmol/L. If it is an elderly patient, the 2-hour postprandial blood glucose of 8.1 mmol/L is regarded as normal, indicating that the patient's 2-hour postprandial blood glucose control is up to standard. Let patients test fasting blood sugar and glycated hemoglobin, if fasting blood sugar is controlled at 6.5-7.5 mmol/L and glycated hemoglobin is controlled at 6.3% or less, they all belong to normal state; 3. Pregnant women: For pregnant women, normal blood sugar during pregnancy does not exceed 10.0 mmol/L for 1 hour after meal and 8.5 mmol/L for 2 hours after meal. Fasting blood glucose should not exceed 5.1 mmol/L. Any point exceeding these values can be diagnosed as gestational diabetes. Therefore, a 2-hour postprandial glucose of 8.1 mmol/L is normal, but it is also necessary to monitor fasting and 1-hour postprandial glucose for abnormalities to determine if gestational diabetes is present. If the patient is a high-risk group for diabetes, it is easy to turn into diabetes, for example, if one of the patient's parents has diabetes, the risk of diabetes in their children is more than 4 times of normal; if both parents have diabetes, the risk of diabetes in their children is 8 times of normal, so the children of diabetic patients must control their blood sugar.