Normal fasting C-peptide indicates normal pancreatic islet cells, and normal fasting insulin indicates normal insulin secretion.
1. Fasting insulin: insulin is a protein hormone secreted by pancreatic islet B cells, and it is the only hormone that lowers blood glucose in the body, generally the normal value of fasting insulin is 5-20 mU/L. Fasting insulin test can reduce the influence of other factors, and it can react to a certain extent that the pancreatic islet function is still OK.
Fasting insulin test can also distinguish the type of diabetes. Some diabetic patients have abnormal postprandial insulin secretion and normal fasting insulin. Patients also need to combine with the postprandial insulin test to make a comprehensive analysis.
2. Fasting C-peptide: C-peptide is secreted by pancreatic islet β-cells.C-peptide is consistent with its own insulin molar amount. Because C-peptide is not easily degraded by the liver, measuring C-peptide is measuring the amount of insulin, which can accurately reflect the function of pancreatic islet cells.
C peptide is often used to distinguish between type 1 diabetes and type 2 diabetes, the general basal value of normal people is not less than 400 pmol / L. If the patient follows the doctor’s instructions to test the fasting C peptide is normal, indicating that the body’s islet cells are normal, pancreatic islet function is still good.
If the patient’s fasting insulin and fasting C-peptide values are abnormal, he should go to the regular hospital in time.