The range of diabetes values includes fasting blood glucose greater than or equal to 7 mmol/l, 2-hour postprandial blood glucose greater than or equal to 11.1 mmol/l, and glycosylated hemoglobin greater than or equal to 6.5%. Normal fasting blood glucose ranges from 3.9 to 6.1 mmol/l, 2-hour postprandial blood glucose is less than 7.8 mmol/l and glycated hemoglobin is less than 6%. Fasting blood glucose is greater than or equal to 7mmol/l, or 2 hours after meal blood glucose is greater than or equal to 11.1mmol/l, or random blood glucose is greater than or equal to 11.1mmol/l, or glycated hemoglobin is greater than or equal to 6.5%, and accompanied by polydrinking, polyuria, polyphagia, and emaciation, the diagnosis of diabetes mellitus is considered. For patients with abnormal blood glucose, they need to monitor their blood glucose several times and go to the hospital in time for a comprehensive evaluation and diagnosis by a professional doctor, and timely treatment under the doctor’s guidance.