Glycated hemoglobin of 6.3% is abnormal, slightly higher than the normal reference value of 4.0% to 6.0%, and the diagnosis should be confirmed after completing relevant examinations. However, for diabetic patients, glycated hemoglobin should be controlled below 7.0%, and 6.3% belongs to the standard of glycemic control. In the human body, hemoglobin and glucose can be combined to form glycated hemoglobin and blood glucose concentration, red blood cell life span, etc., the normal reference value of glycated hemoglobin is 4.0% to 6.0%, 6.3% is slightly higher, it is recommended to improve the fasting glucose, postprandial glucose, glucose tolerance and other related tests, to clarify the diagnosis. For diabetic patients, the goal of glycemic control is generally fasting blood glucose 4.4mmol/L ~ 7.0mmol/L, non-fasting blood glucose not more than 10.0mmol/L, and glycated hemoglobin generally need to be controlled at 7.0% or less. 6.3% of the glycemic control is to meet the standard, but also need to be combined with other indicators of the comprehensive judgment. It is recommended to combine with other test results and clinical symptoms under the guidance of a doctor to make a comprehensive judgment.