High glycosylated hemoglobin is considered to be related to blood sugar and blood system diseases, as follows: 1. Blood sugar factor: because glycosylated hemoglobin greater than 6.5% can be diagnosed as diabetes, so elevated glycosylated hemoglobin, and at the same time, fasting blood sugar and two-hour postprandial blood sugar should be checked to confirm the diagnosis of diabetes. If the glycated hemoglobin is greater than 9.0% and the fasting blood sugar is elevated, or the two-hour postprandial blood sugar is elevated, insulin treatment is required. If the glycosylated hemoglobin is less than 9.0%, the fasting blood sugar is elevated and the postprandial blood sugar is also elevated, the diagnosis of diabetes can be confirmed, for example, if the fasting blood sugar is greater than 7.0 mmol/L or the two-hour postprandial blood sugar is greater than 11.1 mmol/L, the diagnosis of diabetes can be confirmed. 2. Blood system diseases: elevated glycosylated hemoglobin sometimes has to be excluded There are no other systemic diseases, such as elevated glycosylated hemoglobin, and elevated hemoglobin can also cause false elevation of glycosylated hemoglobin. If you encounter this situation, you should first rule out any blood system diseases, and then check the fasting blood sugar and two hours after meals blood sugar, considering that it is related to blood sugar.