C-Peptide

A C-peptide test measures the amount of C-peptide in the blood or urine. It can help healthcare providers determine what type of diabetes a person has: Type 1 or Type 2. It also can reveal how well diabetes treatments are working. Another use for C-peptide is to determine if your pancreas is making insulin.

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Normal results are within the range of 0.5 to 2.7 ng/mL but can vary depending on the lab that is used for testing. A high level of C-peptide could mean a number of conditions. These include a kidney problem or an insulinoma, a tumor of the insulin-making cells in the pancreas.

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The normal physiological C-peptide plasma concentration in a fasted state is 0.9 to 1.8 ng/ml. [1] A high level could indicate insulin resistance, insulinoma, or kidney disease. A low C-peptide is usually present in patients with type 1, or sometimes, type 2 diabetes.