C-Peptide
C-peptide is released together with insulin from the pancreas and shows how much insulin the body makes.
C-peptide is released from the pancreas in the same amount as insulin, but stays in the blood longer. That makes it a steady read on how much insulin the body produces. Read together with glucose and insulin, it gives a fuller view of how the body handles sugar.
A recent meal raises C-peptide, so fasting before the test matters. Carbohydrate intake, body weight, physical activity and sleep also affect the level, and long fasts lower it.
Foods that help
Fish, poultry and eggs, fibre from legumes, wholegrains and vegetables, and fats from avocado, nuts and olive oil.
Foods to limit
Sugar, sugary drinks, white bread and other refined carbohydrates.
Track it through the year
One value is a snapshot. Following it up shows whether what you changed is working.
Related markers
Educational information only — not a diagnosis. Every result is checked against safe limits, and anything critical is escalated for follow-up.
See all 84 markers →