C-Peptide PP

A normal result of a C-peptide test ranges from 0.5 ng/mL to 2.0 ng/mL (or 0.17 to 0.83 nmol/L).

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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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Fasting and calorie restriction may be good strategies for lowering C-peptide levels if you have insulin resistance and/or are overweight. In 12 women with rheumatoid arthritis, calorie restriction and fasting decreased urine C-peptide levels by more than 50% during the fasting periods.