What do the results mean?
A low level of C-peptide can mean your body isn't making enough insulin. It may be a sign of one of the following conditions:
Type 1 diabetes
Addison disease, a disorder of the adrenal glands
Liver disease
It may also be a sign that your diabetes treatment is not working well.
A high level of C-peptide can mean your body is making too much insulin. It may be a sign of one of the following conditions:
Type 2 diabetes
Insulin resistance, a condition in which the body doesn't respond the right way to insulin. It causes the body to make too much insulin, raising your blood sugar to very high levels.
Cushing's syndrome, a disorder in which your body makes too much of a hormone called cortisol.
A tumor of the pancreas
If you have questions about your results, talk to your health care provider.
Learn more about laboratory tests, reference ranges, and understanding results.
