What is the difference between C peptide level and serum insulin level?
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C peptide is produced by your pancreas along with Insulin.
C peptide levels indicate the amount of your endogenous insulin prepared by your pancreas. If a patient is on injectable insulin, his serum insulin levels can get affected by this exogenous insulin but C peptide wont.
Thus if you want to assess the amount of insulin produced by the pancreas in a patient on injectable insulin doses, perform a C peptide test.
C-peptide and insulin are released from the pancreas at the same time and in about equal amounts. So a C-peptide test can show how much insulin your body is making.
Since the half-life of C-peptide is longer than insulin, its levels in the blood are higher than insulin, making it a more reliable measure of insulin production.
This test can be a good way to measure insulin levels because C-peptide tends to stay in the body longer than insulin.