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Metabolic

C-Peptide Blood Test

C-Peptide helps assess pancreatic health and insulin production, which can change with age. Monitoring supports diabetes prevention and metabolic stability in later years.

Doctor's Assessment Included

C-Peptide: what this test 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.

C-Peptide: why this value 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.

C-Peptide: how to prepare

  1. Pause biotin

    Required

    Do you take a supplement with biotin (vitamin B8, common in hair, skin and nail supplements)? Stop it 72 hours before the draw. Biotin interferes with the measurement of these values.

  2. Come fasting

    Required

    From 22:00 the evening before, eat and drink nothing except water. That is at least 8 hours. Skip coffee, tea, chewing gum and smoking that morning. Plan the draw before 10:00.

  • Water is always fine. Drink as usual beforehand, it makes the draw easier.
  • Take your usual medication, unless your own doctor told you otherwise.

C-Peptide: when is testing worthwhile?

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

C-Peptide: symptoms of a high or low value

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.

C-Peptide: lifestyle and this value

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.

C-Peptide: 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.

Tests with related values

These panels measure values from the same category as this marker.

Heart & Metabolism

GLP-1 Baseline Panel

Your starting point before the first injection: blood sugar, cholesterol, pancreas, liver, kidneys, thyroid and nutrients in one measurement.

Insulin (Fasting) ALT (Alanine Aminotransferase) TSH (Thyroid Stimulating Hormone) AST (Aspartate Aminotransferase) HDL Cholesterol HbA1c (Glycated Hemoglobin) Bilirubin (Total) ApoB (Apolipoprotein B) Vitamin B12 Ferritin Potassium Sodium Glucose (Fasting) Total Cholesterol Albumin Lipase Creatinine Vitamin D (25-OH) Triglycerides Bilirubin (Direct) Bilirubin (Indirect)
€214,-
Heart & Metabolism

GLP-1 Extended Panel

The 6-month measurement: everything from the check-in plus insulin, ApoB and your nutrients — especially relevant if you have been eating much less for a while.

Insulin (Fasting) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) HDL Cholesterol HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) Vitamin B12 Ferritin Potassium Sodium Glucose (Fasting) Total Cholesterol Albumin Lipase Creatinine Vitamin D (25-OH) Triglycerides
€196,-

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C-Peptide

€91,-