Glycated hemoglobin is usually measured in %. A glycosylated hemoglobin of 13.8% is relatively serious. A normal person’s hemoglobin is usually between 4% and 6%, while a glycosylated hemoglobin of 13.8% indicates that the patient may have had persistent hyperglycemia for the last 2 to 3 months. Glycated hemoglobin is the product of a non-enzymatic reaction between hemoglobin in red blood cells and sugars (mainly glucose) in the blood serum. It generally remains in the body for about two to three months and is often used to evaluate a patient’s average blood glucose level over the last two to three months. Therefore, a glycated hemoglobin of more than 13.8%, which is above the normal range, is relatively serious and requires tests of blood glucose, pancreatic islet function, and biochemical indicators to determine the cause of the elevated blood glucose and to administer targeted medications. Glycated hemoglobin 13.8% is relatively serious. It is recommended that the patient under the guidance of a professional doctor to carry out a detailed examination, for the specific use of medication.