Glycated hemoglobin of 6.5% does not indicate normal postprandial blood glucose. Glycated hemoglobin is the product of a non-enzymatic reaction between glucose or other sugars and the amino group of hemoglobin. It reflects the average level of blood glucose in the last 2 to 3 months, and can assess the overall situation of blood glucose, but it does not reflect the instantaneous level of blood glucose and fluctuation of blood glucose, and does not indicate whether fasting or postprandial blood glucose is normal. The normal range of glycosylated hemoglobin is 4%~6%, so glycosylated hemoglobin 6.5% is on the high side, but it does not indicate whether postprandial blood glucose is normal or not, and should be perfected with fasting glucose, 2-hour postprandial glucose, and glucose tolerance test to understand the instantaneous blood glucose level, pancreatic islet function, and the presence or absence of diabetes mellitus. Glycosylated hemoglobin 6.5% should go to the hospital and be treated under doctor’s guidance.