Glycated hemoglobin does not require fasting. In the human body, blood glucose combines with proteins in a reaction called glycosylation, and the glycosylated product of hemoglobin is glycated hemoglobin, which is a slow and continuous reaction, and the production of glycated hemoglobin increases when blood glucose rises and decreases when blood glucose falls. Since hemoglobin exists in red blood cells, which have a lifespan of about 100 to 120 days, glycosylated hemoglobin reflects the average level of blood glucose over the last three months or so, and the level of blood glucose at the time of blood collection has little effect on glycosylated hemoglobin. At present, the technology of glycated hemoglobin test is very mature, and the interference of diet on the test result is very small, and it can also be checked after meals.