A 2-hour postprandial blood glucose <7.8 mmol/L is normal; for diabetic patients, the goal of glycemic control is generally a non-fasting blood glucose of not more than 10.0 mmol/L. Under normal circumstances, 2-hour postprandial blood glucose is less than 7.8 mmol/L. In hypoglycemia, fasting blood glucose is less than 7.0 mmol/L, and 2-hour postprandial blood glucose of 7.8 to 11.0 mmol/L belongs to prediabetes. If the 2-hour postprandial blood glucose ≥ 11.1mmol / L, and appeared "three more and one less" symptoms of diabetes, can be diagnosed as diabetes. For diabetic patients, the goal of glycemic control is generally fasting blood glucose 4.4mmol/L ~ 7.0mmol/L, non-fasting blood glucose does not exceed 10.0mmol/L, but also need to set up a glycemic control goal according to the individual situation. If abnormal blood glucose is detected, it is recommended to consult a doctor for further examination and treatment or lifestyle adjustment as prescribed by the doctor.