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Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

Metabolic

C-Peptide

C-Peptide reveals how effectively your pancreas produces insulin. Optimal insulin function supports energy, body composition, and metabolic performance.

What It Measures

This test measures the level of C-Peptide in your blood. Since C-Peptide is produced in equal amounts to insulin, it reliably reflects your pancreas's insulin-producing capacity.

Why It Matters

C-Peptide helps distinguish between type 1 and type 2 diabetes and assesses how well the pancreas is functioning. It can also help evaluate insulin resistance. Consult your healthcare provider for interpretation.

When to Test

Testing may be recommended to evaluate pancreatic function, distinguish diabetes types, monitor insulin-producing tumours, or assess unexplained low blood sugar episodes.

Symptoms

Low Levels

Low C-Peptide may indicate that the pancreas is producing little or no insulin, which is typical of type 1 diabetes. Symptoms may include excessive thirst, frequent urination, and weight loss.

High Levels

High C-Peptide may indicate insulin resistance, type 2 diabetes, or an insulin-producing tumour. Symptoms may include weight gain, fatigue, and difficulty managing blood sugar levels.

Lifestyle Tips

Regular physical activity, a balanced diet with controlled carbohydrate intake, maintaining a healthy weight, and managing stress can all support healthy insulin function and C-Peptide levels.

Frequently Asked Questions

Why test C-Peptide instead of insulin?
C-Peptide is more stable in the blood and is not affected by injected insulin, making it a more reliable measure of your body's own insulin production.
Can C-Peptide help diagnose diabetes type?
Yes, low C-Peptide suggests type 1 diabetes (insufficient production), while high levels may suggest type 2 diabetes (overproduction due to resistance). Your healthcare provider can confirm.
Do I need to fast for this test?
Fasting may be required depending on the clinical question. Your healthcare provider will advise on preparation.