C-Peptide is useful in the evaluation of pancreatic beta cell function (e.g., helping distinguish type 1 from type 2 diabetes mellitus, or monitoring patients who have received islet cell or pancreatic transplants) and for determining the source of insulin in patients with hyperinsulinemic hypoglycemia (e.g., distinguishing insulin-secreting tumors from exogenous insulin administration). It is also sometimes measured as an additional means (more resistant to hemolysis than is insulin itself) for evaluating glucose tolerance tests.

Synonyms: Connecting Peptide, Insulin C-Peptide, Proinsulin C-Peptide

SST, Serum. Volume 1 (0.5) mL. Stability: Refrigerated – 5 Days, Frozen – 2 Months