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The C-Peptide – Fasting, Serum test measures the level of C-peptide in your blood after fasting for at least 8 hours. C-peptide is a byproduct produced when the pancreas releases insulin. This test is often used to assess how much insulin the body is producing and can help distinguish between type 1 and type 2 diabetes.
Assess Insulin Production: The C-peptide test helps evaluate the amount of insulin your pancreas is producing, as C-peptide is released in equal amounts to insulin when the pancreas secretes it.
Differentiate Between Type 1 and Type 2 Diabetes: It helps determine whether the body is producing insulin. Type 1 diabetes typically involves little to no insulin production, while type 2 diabetes often involves insulin resistance with normal or even high insulin production.
Monitor Insulin Secretion in Diabetes: For individuals already diagnosed with diabetes, this test can help assess how well the pancreas is functioning and producing insulin.
The C-peptide test is done after fasting for at least 8 hours (usually overnight). A blood sample is taken, and the level of C-peptide in the serum is measured. Since C-peptide is produced when insulin is secreted by the pancreas, it serves as an indicator of endogenous insulin production.
The typical reference range for C-peptide levels is 0.5 to 2.0 ng/mL (nanograms per milliliter), but the range can vary slightly depending on the laboratory and individual health factors.
Low C-peptide levels may indicate insulin deficiency, as seen in type 1 diabetes or pancreatic dysfunction.
High C-peptide levels can indicate insulin resistance (common in type 2 diabetes) or excessive insulin production.
To Evaluate Insulin Production: The C-peptide test helps assess how much insulin is being produced by the pancreas, particularly useful when there is a need to distinguish between type 1 and type 2 diabetes.
To Diagnose Insulin Resistance: In cases of type 2 diabetes, high C-peptide levels can indicate insulin resistance, where the body produces more insulin to overcome the body’s resistance to its effects.
To Monitor Diabetes: For people already diagnosed with diabetes, this test provides insight into how well their pancreas is functioning and producing insulin, helping healthcare providers optimize treatment.
Test Type: Blood
Reporting: Same Day
Free Home/Office Sample Collection
Fasting: 9-12 Hrs Fasting Required
Best & Honest Price
One Prick Sample Collection Policy
Yes. Book home collection when ordering online or call our team. Trained phlebotomists visit your address at the scheduled slot.
Most routine tests are reported within 24–48 hours after sample validation. Specialized tests may take longer — see your booking confirmation.
CoreLab follows NABL-aligned quality-assured pathology processes with structured SOPs, trained collectors, and MD pathologist oversight.
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