C-Peptide
Here’s what it reflects — and what to do about it.
Longetic pulls together every lab and record you’ve had, follows how C-Peptide changes over time, and explains what’s shifting — so you walk into your next appointment prepared, with reminders for retests along the way.
What is C-Peptide?
A piece released when your pancreas makes insulin, so it shows how much insulin your body is producing on its own.
C-peptide is made in equal amounts to insulin when the pancreas produces it, and because it is not affected by injected insulin it gives a good read on your body's own insulin output. Higher levels can be associated with the body making a lot of insulin, as in type 2 diabetes or an insulin-producing tumor, while lower levels can be associated with the pancreas making little insulin, as in type 1 diabetes. It is often used to help sort out the type of diabetes or the cause of low blood sugar rather than to diagnose diabetes on its own.
What to know about C-Peptide
Understanding C-Peptide means knowing what it reflects, what tends to move it, and the signs that suggest it’s worth a closer look — so you can bring the right questions to your next appointment.
This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Medical Disclaimer.
References
About our sources
Official sources
Government health agencies, national institutes, and intergovernmental bodies whose guidelines carry regulatory or policy weight.
Clinical / professional
Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.
Peer-reviewed research
Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.