When measuring fasting blood glucose, as long as the measurement method is accurate and the testing instrument is normal, then the result of measuring fasting blood glucose is accurate and can understand the body’s blood glucose situation, which is of reference value, but only measuring fasting blood glucose can’t monitor the blood glucose control of diabetic patients. Fasting blood glucose is one of the bases for the diagnosis of diabetes mellitus, and if you find high values of fasting blood glucose, you need to observe whether there are “three more and one less” (the symptoms of polyuria, polyphagia, polydipsia, and weight loss), in order to make it clear whether you are suffering from diabetes mellitus or not. Only fasting blood glucose is easy to misdiagnose, missed diagnosis, it is recommended to improve the 2-hour postprandial blood glucose, but also need to go to the regular hospital in time for further examination, under the guidance of the doctor to comprehensively determine whether diabetes.