C-peptide suppression test

Definition / meaning of C-peptide suppression test

A test used to help diagnose a type of pancreatic tumor called an insulinoma. After fasting, the patient receives an injection of insulin and the level of C-peptide (a substance released with insulin by the pancreas) in the blood is measured. In patients who have an insulinoma, the level of C-peptide is higher than normal.

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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