Mr. Zhang is 72 years old and has been suffering from diabetes for nearly 15 years, usually he has been taking oral hypoglycemic drugs for treatment, and when he comes to the hospital to fill his prescription, he checks his fasting blood sugar before breakfast. However, Mr. Zhang thought that his fasting blood glucose was around 8 mmol/l every time, so his control was not bad, and he felt good about himself and had no special discomfort, so he did not follow the doctor’s advice. Recently, Mr. Zhang cut his right foot accidentally, and thought he would be fine in a few days, but he found that his right foot wound not only did not heal, but also became infected, and his right foot was obviously red and swollen, so Mr. Zhang became anxious and rushed to the outpatient clinic for treatment. The old man was puzzled, he usually took his medication on time, and his fasting blood sugar was not very high, how could there be so many complications? In fact, good control of fasting blood glucose before breakfast does not necessarily mean good control of blood glucose after meals, let alone representing the entire day’s blood glucose control. Although there are various reasons for the occurrence of chronic complications of diabetes such as dyslipidemia and hypertension, poor blood glucose control is an important factor in the occurrence of diabetes complications. Although Mr. Zhang’s fasting blood glucose before breakfast was not very high, glycosylated hemoglobin, an indicator of overall blood glucose control in the previous three months, was very poor, so poor blood glucose control was an important reason for the occurrence of complications in Mr. Zhang. So, is there a simple and practical way for diabetic patients to know whether their blood sugar is under ideal control? Self-monitoring of blood glucose is an effective tool, and combined with glycated hemoglobin monitoring, one can get a basic understanding of one’s blood glucose control. In the actual application, there are some points worth noting in self-glucose monitoring. 1. The selection of the time point of self-glucose monitoring. The time point of self-glucose monitoring includes blood glucose before three meals, blood glucose two hours after three meals, blood glucose before bedtime, blood glucose at 3 o’clock at night and blood glucose monitoring at other points (such as immediate blood glucose monitoring in case of hypoglycemia). Generally speaking, patients with high blood sugar should first pay attention to the monitoring of blood sugar before meals; in addition, diabetic patients who are prone to hypoglycemia, such as the elderly, should monitor blood sugar before three meals to exclude the possibility of hypoglycemia; for patients who have good control of fasting blood sugar but do not meet the glycated hemoglobin standard, they should carry out self-monitoring of blood sugar 2 hours after meals; for patients who inject insulin, they should monitor blood sugar before bedtime, especially For patients who inject insulin, they should monitor their blood glucose before bedtime, especially those who inject medium and long-acting insulin; a patient with high blood glucose before breakfast must exclude the possibility of hypoglycemia at night, and then they should monitor their blood glucose at 3 o’clock at night. 2. The choice of frequency of self-glucose monitoring. For diabetic patients with poor blood glucose control or heavy disease, it is best to monitor 4-7 times a day, and if necessary, the number can be increased until the blood glucose is controlled; for patients whose blood glucose control reaches the standard, they can monitor 1-2 days a week; for patients who use insulin, the frequency of blood glucose monitoring should be increased appropriately, and at the beginning, they can monitor 5 or even 8 times a day to facilitate the blood glucose The frequency of blood glucose monitoring should be increased appropriately, and it can be monitored 5 or even 8 times a day at the beginning to facilitate the control of blood glucose. 3. Flexible application of self-glucose monitoring. Different diabetic patients can flexibly choose the time and frequency of self-monitoring according to their actual situation. For example, it is obviously impractical for diabetic patients who are usually very busy at work to monitor their blood glucose several times a day, such patients can monitor their blood glucose before breakfast, and on rest days, they can monitor their blood glucose four times, including blood glucose before breakfast and blood glucose two hours after three meals, so that they can have a general understanding of their blood glucose level in a day, and combined with regular monitoring of glycated hemoglobin, they can basically achieve an understanding of their blood glucose control. This, combined with the regular monitoring of glycated hemoglobin, can basically achieve an understanding of one’s blood sugar control.