The C-peptide blood test measures the level of C-peptide, a byproduct of insulin production, to evaluate how much insulin your body is making. It is commonly used to differentiate between type 1 and type 2 diabetes, assess insulin resistance, and monitor pancreatic function in people with diabetes or other conditions affecting insulin production.

Calorie-fasting is usually required for accurate results, especially if the test is part of a glucose or insulin evaluation.

After order completion, a provider will submit your Lab Requisition Form to Labcorp, within 24 (business) hours. You will also be emailed a copy of your LRF to take to your nearest Labcorp with valid photo ID. Your results will be available in your Labcorp Patient Portal as soon as they become available, and we will securely email you a PDF copy. Email verification will be required, please check your spam folder.