C-Peptide

Also known as: Insulin C-peptide; Connecting peptide insulin; Proinsulin C-peptide Formal name: C-peptide Related tests: Insulin; Glucose Why Get Tested? To monitor insulin production by the beta cells in the pancreas and to help determine the cause of hypoglycemia When to Get Tested? When you have diabetes and your doctor wants to determine if you are producing enough of your own insulin or if it is time to supplement oral medication with insulin injections or an insulin pump; when your doctor suspects you have insulin resistance; and when you have documented hypoglycemia Sample Required? A blood sample drawn from a vein in your arm and sometimes a 24-hour urine sample Test Preparation Needed? You may need to fast.