Hospital
$150+
Other Labs
$35
TestWell
$29.99
C-Peptide is a byproduct of insulin production released by the pancreas in equal amounts to insulin. Unlike insulin itself, C-Peptide is not affected by external insulin injections, making it the gold standard for measuring how much insulin your body is naturally producing. It is essential for differentiating Type 1 diabetes (low C-Peptide) from Type 2 (normal or high C-Peptide), and for assessing pancreatic beta cell function over time.
Sample Type
Blood draw
Fasting
Required
Results In
2–4 business days
Performed By
Quest
1 biomarker tested
Your C-Peptide results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 2–4 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you.
Fasting for 8–12 hours required.
TestWell Price
$29.99
No insurance needed · HIPAA compliant
Frequently ordered together
Customers who ordered C-Peptide also added these for a more complete health picture.
8 essential blood chemistry markers covering kidney function, blood sugar, and electrolyte balance.
$20.99
Measures total cholesterol, HDL, LDL, and triglycerides to assess your cardiovascular risk.
$24.99
10 tests focused on kidney function — includes electrolytes, BUN, creatinine, and more.
$23.99
C-Peptide
$29.99