A glycosylated hemoglobin of 5.6% is not necessarily adventitious diabetes. Critical diabetes is generally impaired glucose tolerance, a critical state of glucose metabolism between normoglycemia and diabetes. Glycated hemoglobin is a compound in human blood that combines glucose with hemoglobin. Glycated hemoglobin reflects the average blood glucose level in the 2 to 3 months prior to the test, with a normal value of 4% to 6%. Glycated hemoglobin of 5.6% falls within the normal range, so it is not certain that it is impaired glucose tolerance. The American Diabetes Association (ADA) has taken glycated hemoglobin (HbA1c) ≥6.5% as the diagnostic standard for diabetes, and now our country recommends the use of HbA1c to diagnose diabetes in hospitals with laboratory conditions, and HbA1c ≥6.5% can be used as a reference for the diagnosis of diabetes.HbA1c can steadily and reliably reflect the patient’s prognosis. If there are corresponding discomforts, such as polyphagia, polydipsia, polyuria, gradual weight loss, etc., it is recommended to consult the doctor in time and follow the doctor’s advice for early treatment.