Mediki
C-peptide blood test: what your result means
C-peptide reflects the body's own insulin production because it is released with insulin from the pancreas.
- Category
- Blood sugar and insulin
- Standard unit
- nmol/L
- Reported in
- nmol/L, pmol/L, ng/mL, µg/L, ng/dL, ng/100ml and more
What does high C-peptide mean?
Higher values may suggest increased endogenous insulin secretion. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low C-peptide mean?
Lower values may suggest reduced endogenous insulin production. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
C-peptide units and conversion
Mediki shows C-peptide in nmol/L. Labs may report it in other units; Mediki converts them automatically so results from different labs line up on one chart.
| Unit on your report | Convert to nmol/L | Convert back |
|---|---|---|
| pmol/L | 1 pmol/L = 0.001 nmol/L | 1 nmol/L = 1,000 pmol/L |
| ng/mL, µg/L | 1 ng/mL = 0.3311 nmol/L | 1 nmol/L = 3.02 ng/mL |
| ng/dL, ng/100ml, ng% | 1 ng/dL = 0.003311 nmol/L | 1 nmol/L = 302 ng/dL |
| ng/L | 1 ng/L = 0.0003311 nmol/L | 1 nmol/L = 3,020 ng/L |
Convert a value from your report with the blood test unit converter.
Why track C-peptide over time?
A single C-peptide result is a snapshot. Comparing it with your earlier tests shows whether a value is stable, slowly drifting, or responding to a change in treatment or lifestyle, which is often more useful than one number on its own.
Read our guide on how to read blood test results to understand reference ranges, flags and units.
Following C-peptide as part of a panel? See the hbA1c tracker.
Track your C-peptide results in one chart
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Medical disclaimer: This page is general information, not medical advice. Reference ranges differ between laboratories, and only a doctor can interpret your results in the context of your health.