What is it used for?
A C-peptide test is often used to help tell the difference between type 1 and type 2 diabetes. With type 1 diabetes, your pancreas makes little to no insulin, and little or no C-peptide. With type 2 diabetes, the body makes insulin, but doesn't use it well. This can cause C-peptide levels to be higher than normal.
The test may also be used to:
Find the cause of low blood sugar, also known as hypoglycemia.
Check if diabetes treatments are working.
Check on the status of a pancreatic tumor.
