The examination of pancreatic islet function includes insulin, C-peptide, and blood glucose measurement. Pancreatic islet function test: usually in the morning on an empty stomach, eat 75g glucose or 100g flour buns, and draw venous blood to determine the values of blood glucose, insulin, and C-peptide in fasting, 0.5 hours after meal, 1 hour after meal, 2 hours after meal, and 3 hours after meal, respectively. Insulin measurement directly reflects pancreatic islet function, but can be interfered with by exogenous insulin and affect the results. C-peptide and insulin are both derived from 1:1 cleavage of insulinogen. C-peptide is not destroyed by hepatic proteases and is not interfered with by exogenous insulin, so the measurement of C-peptide in the blood can more realistically reflect the secretory function of the pancreatic islets. Blood glucose measurement indirectly reflects the function of pancreatic islets. If you need to test the function of pancreatic islets, you should go to the Department of Endocrinology of regular hospitals for examination, and according to the function of pancreatic islets, under the guidance of specialists to determine the next diagnosis and treatment plan.