Normally, four-hour postprandial blood glucose should be close to fasting blood glucose, 3.9-6.0 mmol/L is normal. Clinically, fasting blood glucose and 2-hour postprandial blood glucose are mostly used as assessment indicators. In normal people, blood glucose rises half an hour after a meal, peaks in about an hour, begins to decline in two hours, and approaches fasting blood glucose in three to four hours. Fasting blood glucose 3.9-6.0 mmol/L is normal, 6.1-6.9 mmol/L is impaired fasting glucose regulation, and ≥7.0 mmol/L along with diabetic symptoms can be diagnosed as diabetes. It is recommended to improve the fasting blood glucose, 2-hour postprandial blood glucose, oral glucose tolerance test, glycated hemoglobin and other related examinations to comprehensively assess the blood glucose situation. For diabetic patients, the goal of glycemic control is generally 4.4mmol/L to 7.0mmol/L for fasting blood glucose, and no more than 10.0mmol/L for non-fasting blood glucose. If the blood glucose value is abnormal, it is recommended to consult the doctor in time and follow the doctor’s instructions to avoid delaying the condition.