The normal value of 2-hour postprandial blood glucose should be less than 7.8mmol/L, so 2-hour postprandial blood glucose 9.1mmol/L is out of the normal range, whether it is very serious needs to be judged according to different people. For the general population is relatively not serious, but should be taken seriously, for diabetes and gestational diabetes is more serious. 1. General population: 2-hour postprandial blood glucose should be less than 7.8mmol/L, so 2-hour postprandial blood glucose 9.1mmol/L is out of the normal range, but does not meet the diagnostic criteria for diabetes, belonging to the glucose tolerance abnormality, the situation is relatively not serious, but need to pay enough attention, so as not to develop into diabetes. 2. Diabetic patients: for diabetic patients, diabetes prevention and control guidelines for non-fasting blood glucose target value is ≤ 10.0mmol / L, so diabetic patients 2 hours after the meal blood glucose 9.1mmol / L has reached the standard. Once diagnosed with diabetes generally need lifelong treatment, the situation is relatively serious, it is recommended to follow the doctor’s instructions for treatment to avoid complications of diabetes. 3. Gestational diabetes: gestational diabetes in the population if the 2-hour postprandial blood glucose 9.1mmol / L belongs to gestational diabetes, is more serious, may cause adverse effects on the pregnant woman, the fetus, the newborn. Therefore, the situation of blood sugar needs to be analyzed according to the specific situation of the patient, can not be generalized, there are abnormalities need to be under the guidance of the doctor systematic treatment.