C-Peptide
C-peptide is released one-to-one with insulin when proinsulin is cleaved in pancreatic beta cells, so it measures endogenous insulin production even in people receiving insulin therapy. Low values suggest type 1 diabetes or advanced beta cell failure, while elevated values accompany insulin resistance, type 2 diabetes, or insulinoma.
2 providers include this
Metabolic Health / Glucose
0.5-2.0 ng/mL
What is C-Peptide?
C-peptide is released one-to-one with insulin when proinsulin is cleaved in pancreatic beta cells, so it measures endogenous insulin production even in people receiving insulin therapy. Low values suggest type 1 diabetes or advanced beta cell failure, while elevated values accompany insulin resistance, type 2 diabetes, or insulinoma.
Why It Matters
Measures how much insulin your pancreas produces. Unlike insulin tests, not affected by insulin injections. Distinguishes Type 1 from Type 2 diabetes. Indicates beta cell function.
Which Providers Test C-Peptide?
Full Provider Comparison
| Provider | Includes | Annual Cost | Biomarkers |
|---|---|---|---|
 Superpower | — | $199 | 100+ (150 with ratios) |
 WHOOP Advanced Labs | — | $349 | 65 |
 Labcorp OnDemand | — | $398 | 40+ |
| — | $486 | 40+ | |
| — | $449 | 288 | |
| — | $349 | 100+ | |
| — | $829 | 54 | |
 Function Health | ✓ | $365 | 160+ |
| — | $250 | 65 | |
| — | $495 | 80+ | |
| — | $895 | 100+ | |
| — | $1950 | 130+ | |
| — | $375 | 95+ | |
| — | $Varies | 75+ | |
| — | $190 | 100+ | |
| — | $99 | 50 | |
| — | $124 | 60 | |
| — | $349 | 130+ | |
| — | $349 | 80+ | |
| — | $375 | 85 | |
| ✓ | $700 | 128 | |
| — | $99 | 100+ |
Frequently Asked Questions
What is C-Peptide?
C-peptide is released one-to-one with insulin when proinsulin is cleaved in pancreatic beta cells, so it measures endogenous insulin production even in people receiving insulin therapy. Low values suggest type 1 diabetes or advanced beta cell failure, while elevated values accompany insulin resistance, type 2 diabetes, or insulinoma.
What is the optimal range for C-Peptide?
The standard reference range for C-Peptide is 0.5-2.0 ng/mL. Optimal ranges may differ based on individual health goals and expert recommendations.
Which blood test providers include C-Peptide?
2 out of 22 blood testing providers include C-Peptide in their panels. This biomarker has limited availability.
What category does C-Peptide fall under?
C-Peptide is categorized under Metabolic Health / Glucose. This category includes biomarkers that help assess related aspects of health and wellness.
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Medical Disclaimer
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs.
Last reviewed:2026-04-12