C-peptide
A small piece your pancreas snips off each time it makes insulin.
Also printed asConnecting Peptide
What it measures
A fragment released whenever your pancreas makes insulin, so it shows how much you are producing.
Separates a pancreas working overtime from one that has run out of reserve - a different problem with a different fix.
Why it matters for how long you stay well
It separates a pancreas working too hard from one that is running out, and that difference shapes how the years ahead are managed.
How it shows up in daily life
It shows how much insulin your own body is still making, which matters most if you already take insulin.
High and low readings
When it reads high
Your pancreas is producing a lot of insulin to keep up.
When it reads low
Insulin production may be lower than usual.
What moves it
Daily life
- weight around your middle
- how much carbohydrate you eat
Medicines known to shift it
- steroids (raise it)
Listed so a result can be read in context. It is not advice to start, stop or change any medicine; that decision belongs with your physician.
Common questions
What does C-Peptide measure?
A fragment released whenever your pancreas makes insulin, so it shows how much you are producing. Separates a pancreas working overtime from one that has run out of reserve - a different problem with a different fix.
What does a high C-peptide result usually mean?
Your pancreas is producing a lot of insulin to keep up.
What does a low C-peptide result usually mean?
Insulin production may be lower than usual.
What is the usual reference range for C-peptide?
A broad adult reference band is 0.8–3.9 ng/mL. Labs differ, so read your result against the band printed on your own report.
Educational only, not a diagnosis. A single number means little without your history and the rest of your panel, so discuss your own results with your physician.
Typical adult reference band
- Adults
- 0.8–3.9 ng/mL
Labs differ. The band printed on your own report is the one that applies to your result.
Reported in ng/mL
Ageing relevance
3/5
A moderate ageing association; used in clinical longevity panels.
Worth knowing
The kidneys clear it slowly, so it lingers in the blood far longer than the insulin it came from.
Have a report with this marker on it? Read it in context.
Upload it to Oraia, our health-intelligence tool, for a plain-language read of your markers that a Genoryx doctor can review.
Your biological age is a number you can measure.
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