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C-peptide Fasting & PP

Parameters1 tested
SampleBlood
Fasting10-12 hrs
Report inSame day

How to prepare

Fasting needed

Do not eat for 10-12 hrs before the test. Plain water is fine.

Good to know

Fast for 10–12 hours before the test (only water allowed). Take your usual medicines unless your doctor says otherwise.

Medicines

Tell our phlebotomist about any medicines you take. Don't stop them without asking your doctor.

Comfortable clothes

Wear a loose sleeve so the sample can be taken easily from your arm.

How it works

Book onlinePick a time slot
Home visitSealed, sterile kit
Lab testingBarcode tracked
ReportIn same day

About this test

C-peptide is released in equal amounts with insulin from the pancreas. Measuring it fasting and after a meal shows how much insulin your own body is making, even if you take insulin injections.

Why is this test done?

  • Tell type 1 from type 2 diabetes
  • Check how much insulin the pancreas still makes
  • Investigate low blood sugar episodes
  • Help decide if insulin is needed

Symptoms — when should you get tested?

  • Newly found diabetes in a young person
  • Frequent low sugar episodes
  • Poor sugar control on tablets

Normal range

Fasting 0.8 – 3.1 ng/mL
Post-meal (2 hours) 2.0 – 8.0 ng/mL

Reference ranges differ slightly between labs, methods, age and sex. Always discuss your report with your doctor.

If your result is high

High C-peptide means the pancreas is making a lot of insulin.

Common reasons
  • Insulin resistance and type 2 diabetes
  • Insulinoma (insulin-making tumour)
  • Kidney disease
  • Some diabetes tablets (sulphonylureas)

If your result is low

Low C-peptide means the pancreas is making little insulin.

Common reasons
  • Type 1 diabetes
  • Long-standing type 2 diabetes
  • Damage to the pancreas

How is the test done?

  1. 1
    Book online

    Choose your slot for home collection or a visit to our centre.

  2. 2
    Blood sample taken

    A trained phlebotomist takes a small blood sample from a vein in your arm with a sealed, single-use needle. It takes about 2 minutes.

  3. 3
    Tested in our lab

    Your barcoded sample is tested on automated machines with strict quality checks.

  4. 4
    Report on WhatsApp

    A pathologist checks the result and the report reaches you on WhatsApp and email.

Frequently asked questions

Ask your doctor. Usually the fasting sample is taken before medicines.

Yes. Please fast for 10-12 hrs before your sample is collected. You can drink plain water.

Your report is usually ready in same day after the sample reaches our lab. We send it on WhatsApp and email, and you can also download it from the Reports page.

Please call our team to confirm whether home sample collection is available for your location and test.

This test needs a blood sample. Fast for 10–12 hours before the test (only water allowed). Take your usual medicines unless your doctor says otherwise.

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