C-Peptide

C-Peptide is a protein released by the pancreas alongside insulin. It measures how much insulin your body is producing on its own.

Category: Diabetes & Glycemic

Also known as: c-peptide, c peptide, connecting peptide

Reference range: 0.8–3.8 ng/mL (Source: ABIM)

Standard unit: ng/mL

High values may indicate

High C-Peptide levels may indicate insulin resistance, type 2 diabetes, insulinoma (insulin-producing tumor), or Cushing's syndrome.

Low C-Peptide levels may indicate type 1 diabetes, late-stage type 2 diabetes, or that insulin production by the pancreas is significantly reduced.