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C-peptide levels are measured instead of insulin levels because C-peptide can assess a person's own insulin secretion even if they receive insulin injections, and because the liver metabolizes a large and variable amount of insulin secreted into the portal vein but does not metabolize C-peptide, meaning blood C-peptide may be a better measure of portal insulin secretion than insulin itself

Dierge E, Debock E, Guilbaud C, Corbet C, Mignolet E, Mignard L, et al

Nitric oxide and redox mechanisms in the immune response