The criteria for determining diabetes mellitus include fasting blood glucose ≥ 7.0 mmol/L, or two-hour postprandial blood glucose ≥ 11.1 mmol/L, or random blood glucose ≥ 11.1 mmol/L, or glycosylated hemoglobin ≥ 6.5%, any of the above criteria, and the clinical manifestations of the “three more and one less”. Diabetes mellitus is a metabolic disease characterized by increased blood glucose levels. Diabetes mellitus is diagnosed when fasting blood glucose ≥7.0 mmol/L, or two-hour postprandial blood glucose ≥11.1 mmol/L, or random blood glucose ≥11.1 mmol/L, or glycosylated hemoglobin ≥6.5%, any of the above criteria are met, and there are also clinical signs of “three more and one less”. “Three more and one less”, namely, polyuria, polydipsia, polyphagia, weight loss, and in some patients, itchy skin, blurred vision, slow wound healing and other manifestations. Patients with abnormal blood glucose are advised to seek timely medical attention and actively cooperate with doctors for treatment.