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C-peptide is a peptide that is made when proinsulin is split into insulin and C-peptide.
C-peptide is generally found in amounts equal to insulin.
A C-peptide test can be done when diabetes has just been diagnosed and it is not clear whether type 1 diabetes or type 2 diabetes is present or to help find the cause of low blood sugar (hypoglycaemia), such as excessive use of medicine to treat diabetes or a noncancerous growth (tumor) in the pancreas (insulinoma).