C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test
C-Peptide Blood Test

Over 250k Biomarkers Tested

C-Peptide Blood Test

$65.00 AUD

Want to know whether your pancreas is still producing its own insulin, or need to understand whether your diabetes is more like Type 1 or Type 2?

Measures C-peptide, a byproduct of insulin production that reflects how much insulin the pancreas is making. Used to distinguish Type 1 from Type 2 diabetes and monitor residual pancreatic function in people on insulin therapy.

Collection Location
Specimen Type

You will be emailed a referral to take to your local collection centre. If you ever have any questions, we're here to help.

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Private health tests

How It Works

Getting your health measured shouldn't be hard! We're here to help you every step of the way.

1
Order a test

Order a test

Order the private test that suits you and your goals. After ordering, you will receive your referral by email.

2
Collect the sample

Collect the sample

Attend one of our 4000+ partner collection centres throughout Australia. Search locations.

3
Receive your results

Receive your results

View all your lab results in your secure health dashboard. Easy!

Overview

The C-Peptide test is like having a window into your pancreas's insulin factory to see how well it's actually working. When your pancreas produces insulin – the hormone that helps your body use sugar for energy – it also releases an equal amount of C-peptide, which acts like a reliable fingerprint of your body's natural insulin production. What makes this test so valuable is that C-peptide levels aren't affected by insulin injections, so it gives doctors a true picture of how much insulin your pancreas is making on its own, even if you're already taking insulin medication.

This information is crucial for understanding what type of diabetes you might have and how to treat it most effectively. Low C-peptide levels typically indicate Type 1 diabetes, where your pancreas has stopped making insulin, while normal or high levels usually point to Type 2 diabetes, where your body makes insulin but doesn't use it well. The test also helps doctors determine whether you need insulin therapy, monitor how your pancreas function changes over time, and even investigate unusual blood sugar episodes or suspected pancreatic tumors. Think of it as getting a personalized roadmap for your diabetes care – one that's based on your body's unique insulin-making ability rather than guesswork.

Symptoms

C-peptide is used to assess whether the pancreas is producing insulin and how much. It's particularly useful for distinguishing Type 1 from Type 2 diabetes, assessing residual beta cell function in people with established diabetes, and investigating hypoglycaemia (low blood sugar). Because it's produced alongside insulin but isn't affected by injected insulin, it gives a cleaner view of the pancreas's own output.

Questions

  • C-peptide is released in equal amounts with insulin but is not removed by the liver and isn't affected by injected insulin. This makes it a more accurate marker of how much insulin the pancreas is actually producing.
  • C-peptide is one of the key markers used in this differentiation. Low or absent C-peptide is characteristic of Type 1; normal or elevated C-peptide with raised blood sugar is more typical of Type 2. Your doctor will combine this with antibody tests and clinical history for a complete picture.
  • Yes — this is one of the main advantages of C-peptide. Standard insulin measurements can't distinguish injected insulin from your own production. C-peptide only reflects what your pancreas is making.
  • Beta cells in the pancreas produce insulin. In Type 1 diabetes, these are progressively destroyed. Some people retain partial beta cell function for years. Knowing whether you still have some residual production can influence management decisions.
  • C-peptide is most informative when reviewed alongside blood glucose markers. Adding HbA1c or fasting glucose to your order gives your practitioner a more complete metabolic picture.

Dr. Vu Tran
Bloody Good’s Chief Medical Officer

Biomarker Tested

How to prepare

For most purposes, no fasting is required. However, some clinical scenarios call for a fasting sample or a test taken after a standardised meal. Follow any specific instructions from your practitioner. If none have been given, a fasted or post-breakfast sample are both acceptable for general assessment.

After the test

Take your result to your GP or endocrinologist. It's most meaningful when reviewed alongside your glucose levels, HbA1c, and clinical history. If you're being investigated for diabetes type, your specialist will combine C-peptide with other markers and antibody tests to form a full picture.

Your test results will be available in your private dashboard. If there are any urgent issues, we'll let you know so you can follow up with your health professional.

Understanding results

- Low or undetectable C-peptide in a person with diabetes suggests the pancreas is producing little or no insulin — consistent with Type 1 diabetes or late-stage beta cell failure.
- Normal or elevated C-peptide alongside elevated blood glucose suggests insulin resistance (Type 2 pattern) rather than lack of insulin production.
- Very high C-peptide alongside low blood glucose can indicate an insulinoma — a rare insulin-secreting tumour. This requires specialist investigation.
- C-peptide is reported in nmol/L or pmol/L — reference ranges vary by lab and context.

Testimonials

What Our Customers Say

4.9
Average Rating
5,500+ Customers Tested
250,000+ Individual Biomarkers
A
Adam O. ACT

Simple health checks in my control

I didn't know that private blood tests were an option. Tried this platform as the packages suited what I wanted for a good price. Easy to follow instructions, and super quick results. Platform provides more information than my gp's ever have on the tests and what the results meant. Would like more clinics to be able to test at (specifically Capital Pathology) but there is a decent network. Will continue to use.

The Performance Check
W
Wayne S. NSW

Bloody Good

This is a great service, very helpful support, cheaper than going to the doctor for a blood test

Vitamin D (25-OH)
C
Christopher N. NSW

Quick access to blood tests

BLOODY GOOD is a very efficient route to access blood testing for a visitor outside the Australian health system. It is quick with the necessary referral and documentation, and quick with results. Thank you

Full Blood Count (FBC) Blood Test
R
Rebecca Y NSW

Great Service!

Fantastic service to deal with, I love the extra explanations for all the tests.

Glycated Haemoglobin (HbA1c)
O
Olga B. New South Wales

Convenient

Getting a referral was easy. Laverty pathology accepted it. Bloody Good offers an affordable and convenient way to check essential blood markers.

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Marita S. Queensland

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Lukas C. NSW

Quick, easy, hassle free

Excellent service, quick, easy, hassle free, can recommend.

Testosterone Free/Total + SHBG
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ABDUL S. QLD

Amazingly quick and efficient

Very easy to use. Love that it stores your blood tests.

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Andre D. QLD

5 Stars

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"I'm a little biased as I work here! However, I love that The Bloody Good Test tracks my health over time. After turning 40, I wanted to make sure I wasn't going to drop dead from something basic I should have known about earlier. Measuring all my core biomarkers each year gives me peace of mind my health is on the right track"
Cameron Smith Head of Ecommerce, Brisbane

Frequently bought together

Frequently Asked Questions

Most collection centres accept walk-ins. Some may require a booking - check details when you click on your chosen location.

If your test needs fasting, we’ll include that in your instructions after you order. Fasting usually means no food for 8–12 hours, but water is fine.

Just your pathology referral form (we email it to you)

Of course. Just maybe don’t bring the friend who faints at the sight of blood.

They’re the highly trained professionals who take your blood sample - with a steady hand and a sharp needle. They love blood, but don’t worry… they’re not vampires. Just legends who make blood tests quick, clean, and (almost) painless.

Some of our tests include Urine, Stool, Saliva and more. Each test will have a clear description on what sample you will need to give and instructions on how.