C Peptide Fasting Test
- Category
- Diabetes
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 3 days
- Fasting
- Required
- Fasting Hours
- 10-12 hours
- Age
- 5+ Years
What Is This Test?
Measures C-peptide in your blood after an overnight fast. C-peptide is released in equal amounts with insulin, so it shows how much insulin your own pancreas is making.
Why this test is performed?
Helps distinguish type 1 from type 2 diabetes, assess remaining insulin production, and investigate unexplained low blood sugar. Unlike insulin tests, it is not affected by injected insulin.
Who should take this test?
Excessive thirst, frequent urination, tiredness, slow-healing wounds, weight gain/obesity, family history of diabetes, adults over 30 and people with diabetes.
Test Preparation
Fast for 10–12 hours (water allowed).
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
Read our Editorial Policy and Medical Review Process.
- Report time: In 8 days
- No fasting
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Frequently asked questions
It suggests the pancreas is making little insulin, as seen in type 1 diabetes or long-standing type 2 diabetes.
Yes. Fast for 10–12 hours before the sample (plain water is allowed). An early-morning slot makes this easy. Take regular medicines as advised by your doctor.
Blood sample taken from a vein in your arm.
Usually within 31–55 hours after the sample reaches the lab. You will receive the report online.
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