The diagnostic criteria for diabetes are the result of a comprehensive, integrated and complex statistical analysis of a large amount of scientific data on diabetes accumulated over many years in many countries and regions. First of all, it is necessary to understand “How did the diagnostic criteria for diabetes come about? They were developed through a comprehensive, integrated and complex statistical analysis of a large amount of scientific data on diabetes accumulated over many years in many countries and regions. The scientific research data that gave birth to the current diagnostic standard was concentrated in 1976-1996, which is a “soil” with intravenous blood glucose as the main nutrient (especially because there are many studies in the early years and there is no finger blood glucose meter with stable performance yet), so it can only breed “intravenous blood glucose as the standard of The diagnosis is based on venous blood glucose. Why is it necessary to pay attention to so many details of blood glucose test? There are physiological fluctuations in human blood glucose, and the blood glucose of a normal person may fluctuate to the diagnostic range of diabetes, so usually, one test result cannot be used as a basis for diagnosis. Patients often ask their doctors to diagnose diabetes based on “the report of a physical examination organized by the organization, or a certain blood glucose result, etc.” and even ask for prescription of medication. Such test reports are usually not used to diagnose diabetes! Why? First of all: human blood glucose has physiological fluctuations, and normal people’s blood glucose may fluctuate to the diagnostic range of diabetes under normal circumstances, so usually one test result cannot be used as a basis for diagnosis. Secondly, many disease states and medications can affect blood glucose, which can make blood glucose falsely not high in those who actually have diabetes, or falsely increase blood glucose in those who actually do not have diabetes, the former resulting in a missed diagnosis and the latter resulting in a misdiagnosis. The results of tests without attention to detail are only “screening results” and are usually not used for diagnosis.