People who need to measure fasting blood glucose are recommended to fast for 8 to 10 hours before the blood draw, generally fasting from 10 to 12 p.m. the night before to keep fasting, and testing at 8 a.m. the next morning, depending on the time of the blood draw. Fasting blood glucose need to maintain the overnight fasting state, generally to keep 8 ~ 10 hours without food to the next morning blood test blood glucose concentration, so if the next day 8 o’clock for fasting blood glucose blood test, then the night before the blood glucose test is recommended to keep fasting from 10 to 12 o’clock. This can be extrapolated according to the actual time of blood sampling. The normal range of fasting blood glucose is 3.9~6.0mmol/L. If you find abnormal fasting blood glucose value, it is recommended to go to the hospital immediately.