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NCI Dictionary of Cancer Terms


C-peptide suppression test  listen  (… PEP-tide suh-PREH-shun …)

  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.