C-Peptide

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

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

• Taking medicines, such as insulin, sulfonylurea medicines for type 2 diabetes, corticosteroids, diuretics, or birth control pills.
• Using alcohol.
• Having kidney failure. Both insulin and C-peptide are removed from the body by the kidneys. C-peptide levels may be high in a person with kidney failure.
• Being obese. More insulin is made in obese people and can cause high levels of C-peptide.

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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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