C-Peptide

Connecting Peptide Assay (C-Peptide), Insulin C-Peptide

Why It Is Done

A C-peptide test is done to:

• Help tell the difference between type 1 diabetes and type 2 diabetes.
• Find the cause of low blood sugar (hypoglycemia).
• Check to see whether a tumor of the pancreas (insulinoma) was completely removed.

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Author:	Caroline Rea, RN, BS, MS	Last Updated: July 28, 2008
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine Alan C. Dalkin, MD - Endocrinology
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