One of the misconceptions in diabetes diagnosis: fasting blood glucose is valued over postprandial blood glucose Fasting blood glucose can only represent the blood glucose control for a period of time from the night to the next day before breakfast. Years of experience in diabetes prevention and control tells us that despite good control of fasting blood glucose, if postprandial blood glucose is not in the normal range for a long time, various complications of diabetes (such as heart disease, kidney disease, retina, neuropathy) can hardly be avoided. Postprandial hyperglycemia is in a very important position in the process of occurrence and development of type 2 diabetes. Postprandial hyperglycemia is the most harmful and causes the most serious adverse consequences, and is the main risk factor for diabetic complications. There is growing evidence that postprandial hyperglycemia has important implications for diabetes and its microvascular and macrovascular complications, which are an important cause of disability in diabetes. Studies have shown that diabetic patients with only fasting glucose control and poorly controlled postprandial hyperglycemia have an increased incidence of myocardial infarction and mortality. Diabetes diagnosis misconception two: emphasis on blood glucose rather than glycosylated hemoglobin Blood glucose can only respond to changes within 10-15 minutes, glycosylated hemoglobin can respond to the overall level of blood glucose for 3 months, and it mainly responds to postprandial blood glucose level. Therefore, glycated hemoglobin is an ideal indicator for diabetes to assess the level of blood glucose control. Diabetes is a multi-causal metabolic disease characterized by chronic hyperglycemia due to impaired glucose, fat and protein metabolism caused by insufficient insulin secretion and/or defective insulin action. Long-term development can produce severe macrovascular and microvascular complications, leading to abnormal function or even failure of multiple organs, especially the eyes, kidneys, nerves, heart and blood vessels. In the treatment of diabetes, the control of postprandial hyperglycemia is the goal to obtain better results. For many years, the treatment of diabetes has been to control fasting blood sugar as the goal of treatment, which can achieve certain results. In recent years, studies have begun to target postprandial glucose control as the goal of treatment. Compared to patients with fasting blood glucose control as the treatment goal, patients with postprandial blood glucose control have a significant decrease in glycosylated hemoglobin, and the clinical benefits are more obvious. Patients with diabetes in pregnancy are treated with the goal of controlling postprandial glucose. Therefore, after being diagnosed with type 2 diabetes, not only fasting blood sugar and urine sugar need to be checked regularly, but also postprandial blood sugar should be monitored without fear of trouble. And we should not pay one-sided attention to fasting blood sugar only, nor should we think one-sidedly that fasting blood sugar control is enough.