Fasting blood glucose 6.3 glycated hemoglobin 4.8 can be considered as impaired fasting blood glucose, need to improve postprandial blood glucose monitoring. Fasting blood glucose 3.9-6.0mmol/L is normal, 6.1-6.9mmol/L is considered impaired fasting blood glucose, and diabetes mellitus should be considered if it is greater than or equal to 7.0mmol/L. Fasting blood glucose 6.3mmol/L, it is recommended to improve the 2-hour postprandial blood glucose, if the 2-hour postprandial blood glucose is greater than or equal to 11.1mmol/L, also consider the possibility of diabetes mellitus. Glycated hemoglobin can reflect the patient’s average level of blood glucose in the last 2~3 months, which is of diagnostic significance for hyperglycemia and large fluctuation of blood glucose, normal people’s glycated hemoglobin is in the range of 4-6%, and glycated hemoglobin of 4.8 belongs to the normal range. Fasting blood glucose 6.3mmol/L is recommended to consult a doctor in time, under the guidance of the doctor for examination and treatment.