Blood glucose 6mmol / L both fasting blood glucose or 2 hours after meal blood glucose are normal, generally does not matter. Blood glucose refers to the concentration of glucose in the blood, divided into fasting blood glucose, 2-hour postprandial blood glucose, the normal range of fasting blood glucose is 3.9 ~ 6.1mmol / L, 2-hour postprandial blood glucose normal value <7.8mmol / L. Therefore, when the blood glucose measurement is 6mmol / L is normal. When there is an abnormality in blood sugar, glucose tolerance test can be perfected to understand the body's ability to regulate blood sugar and whether there is diabetes or not, and glycated hemoglobin can also be perfected to understand the blood sugar level in the last 2 to 3 months. If there is any abnormality in blood glucose, you should go to the hospital for further diagnosis and treatment under the guidance of the doctor.