It is usually recommended to diagnose diabetes under the guidance of a doctor, which can be analyzed comprehensively from the aspects of medical history, laboratory tests, clinical manifestations, etc. It is not recommended to judge the presence or absence of diabetes on your own. 1. Medical history: whether the patient suffers from obesity, hyperlipidemia, hypertension and other diseases, which are very easy to be combined with diabetes; or whether there is a first-degree relative who suffers from diabetes. 2. Laboratory tests: Fasting blood glucose test blood glucose concentration greater than or equal to 7mmol / L or two hours after the meal blood glucose concentration greater than or equal to 11.1mmol / L, random blood glucose greater than or equal to 11.1mmol / L, but also through the results of the glycated hemoglobin and other tests to determine. 3. Clinical manifestations: excessive drinking, excessive eating, excessive urination and weight loss are typical clinical manifestations of diabetes. If there are symptoms of diabetes, it is recommended to go to the hospital and ask the doctor to make a judgment, and it is not advisable to make a blind judgment on your own.