C peptide ELISA kits are assays designed to detect the connecting peptide, a short chain of 31 amino acids. It connects chain A of insulin to chain B of proinsulin. When beta cells in the pancreas release insulin, the C peptide is released in almost equal amounts. Due to this relationship, it acts as a biomarker for insulin. C-peptide can be used to differentiate between endogenous and exogenous insulin. Measuring the level of C peptide can help to differentiate Type 1 and Type 2 diabetes. Visit the supplier page for more information about detection range and reactivity.