Blood tests for diabetic patients include the following two main items: 1. If a patient is found to have abnormal blood sugar, he or she needs to go to an outpatient clinic to confirm the diagnosis of diabetes. The main tests are oral glucose tolerance test, as well as simultaneous insulin release test, C-peptide release test and glycated hemoglobin to further confirm whether the patient has diabetes or not; 2. The items to be checked include fasting blood sugar, two-hour postprandial blood sugar, as well as liver and kidney function, blood lipids, electrolytes and other indicators. There is another index, glycosylated hemoglobin, which is to evaluate the level of blood glucose control of the patient in the past 2-3 months. Patients with a long history of diabetes may also need to check urine routine and urine microalbumin, to see if there are any kidney problems.