Some of the diabetes tests require fasting, such as fasting blood glucose, liver and kidney function, and some do not, such as glycosylated hemoglobin and urine glucose. 1. Items that require fasting: fasting blood glucose ≥7.0mmol/L, highly suspicious of diabetes, can also be used to understand the immediate blood glucose situation; liver and kidney function is used to assess the state of the patient’s liver and kidney function; C-peptide release assay is used to understand the patient’s pancreatic islet reserve function. 2. Items that do not require fasting: glycated hemoglobin can be used to assess the patient’s blood glucose control in the past three months; urine glucose, urine ketone bodies can be used to assist in the diagnosis of suspected ketoacidosis; funduscopic examination can be used to assess the presence of diabetic endophthalmopathy, and so on. The presence of diabetes, must be under the guidance of the doctor for standardized treatment, regular follow-up.