All three consecutive blood glucose measurements need to be compared with normal blood glucose values for reference, not just whichever is the best. Pre-meal and post-meal blood glucose are usually different, and mood, diet, exercise and measurement method will all affect the blood glucose level. Clinically, fasting blood glucose, 2-hour postprandial blood glucose and random blood glucose are used as reference standards. If three consecutive blood glucose measurements are normal, there is no need to worry; if three consecutive blood glucose measurements are taken and one or two or three consecutive blood glucose levels are abnormal, such as fasting blood glucose exceeding 7.0 mmol/l or two-hour postprandial blood glucose exceeding 11.1 mmol/l, then diabetes is not ruled out, and timely consultation is recommended. If the blood glucose measurement is abnormal, it is recommended to go to the endocrinology department as soon as possible, to further improve the glucose tolerance test, glycated hemoglobin, urine routine and other tests, to clarify the diagnosis and early treatment.