The normal level of fasting blood glucose is different for different people. The so-called fasting blood glucose generally refers to the blood glucose level in the state of not eating for more than 8 hours, if there is no specific reference, it is generally recommended that the blood glucose checked after 10:00 pm the previous night when no more fasting is known after 6:00 am is called fasting blood glucose, occasionally some doctors may consider the blood glucose before the next meal also belongs to fasting blood glucose. The normal value of fasting blood sugar for a healthy adult is generally 3.9-6.1 mmol/L. When it is lower or higher than this level, it is considered abnormal. When the blood sugar is below 3.9mmol/L then it is hypoglycemia. When the blood sugar is higher than 6.1mmol/L then there is abnormal blood sugar. When the fasting blood sugar is higher than 6.1mmol/L but lower than 7.0mmol/L, it is called impaired fasting blood sugar regulation. At this time, the patient’s symptoms and postprandial blood sugar should be considered at the same time for a comprehensive assessment, and if necessary, a glucose tolerance test should be performed. Some people consider this stage to be pre-diabetes. When fasting blood glucose rises further than 7.0mmol/L, diabetes is highly suspected and a review or glucose tolerance test is needed to confirm the diagnosis. At present, the international normal value of blood sugar for children is the same as that for adults, but the requirements for blood sugar of pregnant people are different. The normal value of fasting blood sugar in blood sugar of pregnant women should be less than 5.6mmol/L, which is lower than that of healthy adults, because the control of blood sugar during pregnancy is crucial to ensure the safety of mother and baby. As mentioned above, the normal value of fasting blood glucose is different in different people, the normal value of fasting blood glucose for normal healthy adults and children is 3.9-6.1mmol/L. The normal value of fasting blood glucose for pregnant women should be less than 5.6mmol/L.