Blood glucose is usually not visible in routine blood tests, and a blood glucose of 4.81 mmol/L but a glycated hemoglobin of 6.1% after a blood test is usually not diagnostic of diabetes mellitus. Consultation with your doctor is recommended for the diagnosis of diabetes. The normal range of fasting blood glucose is 3.9~6.1mmol/L, the normal range of two-hour postprandial blood glucose should be less than 7.8mmol/L, and the random blood glucose should be less than 11.1mmol/L. Therefore, the blood glucose of 4.81mmol/L after blood sampling test is within the normal range. Glycated hemoglobin can reflect the average blood glucose concentration in the past two to three months, and its normal range is 4%~6%, so 6.1% is on the high side, indicating that the average blood glucose concentration in the past three months is on the high side. The diagnosis of diabetes needs to refer to the fasting blood glucose, two-hour postprandial blood glucose and other tests, as well as the presence of polydipsia, polyphagia, polyuria and other diabetes-related manifestations of a comprehensive judgment, only rely on the immediate blood glucose is normal and the elevation of glycosylated hemoglobin can not be diagnosed with diabetes, the patient should also be perfected other related checks. If the blood glucose is 4.81mmol/L but the glycosylated hemoglobin is 6.1%, it is recommended to go to the hospital for consultation.