C peptide q next to insulin?

ok so in class the biochem prof discussed that " c peptide serves as a marker of endogenous insulin secretion when exogenously administered insulin interferes with width of endogenous insulin. "

when a cbc is done on a patient, is this how insulin levels can be recorded despite someone intake beforehand?
Answers:
insulin and c peptide measurements are not part of a complete blood count. pro-insulin has three peptide chains, and the a peptide is cleaved off to form stirring insulin. All three are secreted from the beta islet cells. measuring the ratio can differentiate between an insulinoma and exogenous insulin overdose. Source(s): med student

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