Diabetes mellitus can be tested for glycated hemoglobin, glucose tolerance test, urinalysis, blood glucose and so on after hanging up with the endocrinology department, and it is recommended to consult with your doctor. Generally, diabetic patients have symptoms of dry mouth, excessive drinking, excessive eating, excessive urination, weight loss, and a few are accompanied by vision changes, skin infections, numbness of hands and feet, and other manifestations. There are also cases where diabetic patients simply have elevated blood glucose without any clinical symptoms. Normal fasting blood glucose is 3.9~6.1mmol/l, two hours after meal blood glucose should be less than 7.8mmol/l. Glycated hemoglobin normal value is 4%~6%, which reflects the average blood glucose level of the last 2~3 months, it is recommended to refer to the indicators of the local hospital. If the blood sugar exceeds the normal range, you need to go to the endocrinology department to further improve the glucose tolerance test, glycated hemoglobin, urine routine and other tests to rule out the existence of diabetes or abnormal glucose tolerance.