A fasting blood glucose of 5.8 mmol/L and a postprandial blood glucose of 12.6 mmol/L may be diabetes mellitus. Diabetes mellitus is a metabolic disorder characterized by chronic hyperglycemia due to multiple etiologies, caused by defective insulin secretion or utilization. The diagnostic criteria for diabetes mellitus are fasting blood glucose ≥7mmol/L, or 2-hour postprandial blood glucose ≥11.1mmol/L, or glycosylated hemoglobin ≥6.5%, or random blood glucose ≥11.1mmol/L and the main symptoms of diabetes mellitus of the three more than one, that is, more drinking, more eating, more urination, and weight loss. For those who do not have obvious symptoms, two blood glucose measurements are needed to confirm the diagnosis. Fasting 5.8 postprandial 12.6, meet the postprandial blood glucose ≥ 11.1mmol / L, can be diagnosed as diabetes. It is recommended that patients with elevated blood glucose go to a regular hospital in a timely manner, complete the relevant examinations, and standardize the diagnosis and treatment under the guidance of the doctor, so as to avoid delaying the condition.