A two-hour postprandial blood glucose of 9mmol/L is not normal and is classified as hypoglycemic tolerance. Diabetes can be considered when the diagnostic criteria for diabetes are fasting blood glucose value ≥ 7.0mmol/L or postprandial blood glucose value ≥ 11.1mmol/L. Fasting blood glucose 6.1-6.9mmol/L and postprandial blood glucose 7.8-11.0mmol/L are classified as impaired glucose tolerance. When the blood glucose value reaches the standard for diagnosing diabetes at one time, it cannot be used as the basis for diagnosing diabetes. When suffering from a serious disease or when the body is in a stressful situation, the blood glucose value will increase stressfully, and this disorder of glucose metabolism, which often lasts for a short period of time, will automatically return to the usual level after the disease is in remission or the stressful situation is eliminated. Therefore, it is necessary to recheck the blood glucose after the uncertainty is removed to clarify the metabolic situation. For those who do not have diabetic symptoms, the diagnosis of diabetes cannot be confirmed on the basis of one blood glucose value reaching the diagnostic standard of diabetes, but must be rechecked on another day, and if the result of the recheck does not reach the diagnostic standard of diabetes, it should be rechecked regularly. The diagnosis of reduced glucose tolerance or diabetes should be based on the results of two glucose tolerance tests within three months, and the average value should be applied to judge.