🩺 Affordable Private Healthcare

Blood Tests > C-Peptide Test

C-Peptide Test

Price
£165

Turnaround

5 working days

Appointment

15 minutes

4.9

Rated 4.9 out of 5

4.7

Rated 4.7 out of 5

at a glance

Price: £165

Turnaround: 5 working days

Appointment: 15 minutes

4.9

Rated 4.9 out of 5

4.7

Rated 4.7 out of 5

How A C-Peptide Test Can Make A Difference

A C-peptide blood test is an important diagnostic tool for evaluating insulin production and overall pancreatic function. It is a simple procedure that can provide valuable insights into diabetes, insulin resistance, and other metabolic disorders.

At our City Walk-In Clinic in London, we offer expert C-Peptide testing with results you can trust. Plus, there is no extra charge for the blood draw (phlebotomy fee) required for this test.

Is A C-Peptide Test Right For You?

Approximately 4.6 million adults have been diagnosed with diabetes in the UK, and 1.3 million adults have undiagnosed type 2 diabetes. If you are currently experiencing common diabetes symptoms, like excessive thirst, fatigue, or unexplained weight loss, we recommend getting a C-Peptide test.

Getting tested can also be useful if you need clarification on the type of diabetes you may have or require monitoring of insulin production after starting diabetes treatments. This test is also highly recommended if you are being assessed for conditions like hypoglycaemia or insulinoma (a rare insulin-producing tumour).

The Importance Of Testing

Your C-peptide levels can help assess your overall insulin production. That means that a C-Peptide blood test can help:

Diagnose type 1 or type 2 diabetes: low C-peptide levels can help detect Type 1 diabetes, while higher levels may suggest Type 2 diabetes
Help monitor your insulin production: a C-peptide blood test helps evaluate your pancreatic function (and can help guide appropriate treatment plans)
Detect potential insulin resistance: high C-peptide levels typically pinpoint conditions like prediabetes or metabolic syndrome
Manage diabetes: a C-peptide blood test can also help provide insights into whether additional treatments, such as insulin therapy, are necessary.

Key Benefits Of A C-Peptide Test

A C-peptide test may be recommended if you show signs of diabetes, including persistent fatigue, excessive thirst, or unexplained weight loss. It is also valuable for evaluating your body’s insulin production and determining the appropriate treatment plan.

If your healthcare provider suspects diabetes or related conditions, they may suggest a C-peptide test. This test can help confirm the diagnosis, clarify the type of diabetes, or monitor how well your pancreas produces insulin.

C-Peptide testing is often advised if you are experiencing symptoms of diabetes, need a more precise diagnosis regarding the type of diabetes, or require tracking of insulin production. It is also beneficial when assessing other metabolic issues or rare conditions like insulinoma.

You may benefit from a C-Peptide test if you are dealing with diabetes symptoms such as fatigue, excessive thirst, or weight loss. This test helps determine the type of diabetes, evaluate insulin production, and guide treatment strategies effectively.

C-Peptide Testing

Your doctor may recommend a C-Peptide test for several reasons, including:

Diagnosing Diabetes: To determine if you have Type 1 diabetes (where the body produces little to no insulin) or Type 2 diabetes (where insulin is produced but not effectively used).
Assessing Insulin Production: To evaluate how much insulin your pancreas is making, which is particularly useful for individuals already on insulin therapy.

Monitoring Diabetes Management: To check how well your treatment plan is working and whether insulin injections are necessary.
Diagnosing Hypoglycemia Causes: To investigate low blood sugar episodes and their potential triggers.

Statistics

Of UK diabetes diagnoses use C-peptide testing insights

0 %

Of type 2 diabetes cases in the UK show high C-peptide

0 %

Of UK prediabetes patients display raised C-peptide levels

0 %

Of UK insulinoma diagnoses rely on C-peptide testing

0 %

Booking Your C-Peptide Test

book online or call us

Use our online booking engine or book your test by giving us a call.

Choose your test type

On the online booking engine select the “appointment type” you need.

meet with our experts

You will be seen by one of our friendly phlebotomists or trained clinicians.

Procedure

Type of sample taken: Blood

Why Choose Walk In Clinic
for blood testing

No
Hidden Charges

Transparent fees. The price you see is the price you pay.

No GP consultation
needed

No GP appointment requirement for blood tests

Established
since 1998

Experienced doctors & a professional team.

Strictly
confidential

Your medical records are kept private at all times.

testimonials

Jooyoung Nam

10 September 2026

I had a very positive experience at this clinic for my blood test and the follow-up with the GP. I particularly appreciated the care and attention throughout the process, including the follow-up after my results. Thank you to the team for making the experience so reassuring. I would happily recommend this clinic.

Lucy Cropper

31 August 2026

I had a fantastic experience at the Harley Street clinic. Staff were very welcoming and professional and booked my second blood test here also.

Truman Packard

19 August 2026

The service was efficient, personable and very complete. The doctor who saw me was very good, patient and sensitive. I’ll be going back.

Sue Heald

11 August 2026

As an international visitor, I was very grateful for the prompt attention to my request for an appointment. Dr Ali was respectful and empathetic in regard to my condition and suggested further treatment, which I was able to organise for the next day. Both offices I attended treated me appropriately and I would recommend Harley Street Health Walk-in Clinics to anyone visiting London who requires medical attention.

Isabella Johnson

3 August 2026

Highly recommend City Walk-In Clinic Really pleased with my experience at City Walk-In Clinic. I booked a female hormone test because I wanted some answers about a few symptoms I'd been having, and the whole process was straightforward. The staff were welcoming, friendly and didn't make me feel rushed at all. The blood test was quick, and they explained everything clearly before taking the sample. My results came back sooner than I expected, and it was reassuring to have everything presented in a way that was easy to understand. I'd definitely use the clinic again and would recommend it to anyone looking for a private female hormone test. Professional service, lovely staff and an all round positive experience.

Anabella Styles

9 July 2026

I had a private gp appointment yesterday as my feet have been swelling every day over the past few days. So I booked an appointment with Dr Heather. Dr Heather explained the possible causes of the swelling, including the heat that we are currently experiencing in London. Recommended further investigation if the swelling persists, to identify the underlying issue rather than just making assumptions.

Mary Anne

3 July 2026

I have used City Walk In Clinic as my go to place for routine blood tests. My recent full health check gave my doctor some clues that i may be approaching my menopause era. So my doctor has recommended that i do some tests to find out if indeed i am entering perimenopause, as the symptoms are there. Will be having my tests in the next few weeks. So glad i had a full health check, because all these symptoms were driving me crazy.

Dona P

24 June 2026

Really good service throughout. Reception staff were welcoming and the blood test was efficient and quick. Highly recommended as blood tests can be booked on the day with results being sent very quickly.

A B

23 June 2026

Great location for blood tests if you want very fast results! I got my results the same day, highly recommend!

Grace Vizcaino

2 June 2026

Very good service at a very reasonable cost. Same day results, I do recommend this clinic and would certainly be using it again.

Shona McGovern

16 May 2026

I attended The Harley Street Walk/in centre in the City recently. I was able to book my appointment the day before for a blood test at a time that suited me. The booking process was straightforward. The doctor that conducted the venous draw was efficient and very pleasant. I have never had such a painless venous draw and I have had many! My appointment was at 5pm and I had my results before 8 am the following day. I will be very happy to book my tests here in the future. Thank you.

Monju Zaman

19 April 2026

Very easy to arrange the appointment with plenty of immediate availability. Very convenient location. Friendly medical associate who took my blood and results arrived very promptly, ie early the next day. Seamless experience.

Nat N

17 April 2026

Attentive, welcoming and professional staff in a great area which is easy to get to! I always feel like I'm in good hands

Abdalla Mohamud Mohamed

18 March 2026

I had a very good experience at the clinic. The staff were punctual friendly and professional. I had a blood test done and received the results quickly on the same day. I would definitely recommend visiting them.

Ena Quinn

9 March 2026

Speedy and efficient place for quick bloods. Results have been same day for me. Very friendly staff too which is always a bonus

Arthur Attwell

22 January 2026

Great experience. I was visiting London from abroad and I needed a blood test before travelling onward. I arrived without an appointment and was done in 20 minutes. The staff were all lovely. I received my test results by email the next morning.

Omar

19 January 2026

Really professional and friendly. They always provide their results quickly!

Antigoni S.

17 January 2026

Very good experience — all the staff were very polite, I was assisted immediately, and the results were available the same day. Thank you very much Private City Clinic!

Sheila Daley

31 December 2025

I wanted a cholesterol check up and chose this clinic because it seemed to offer a competitive price for a detailed report. And so it turned out to be. Received a prompt and professional service at a price that was significantly less than other nearby providers in central London. I have now used it twice and would definitely recommend.

JenniferP-344

18 February 2025

I appreciated the discreet and professional care during my sexual health test. The clinic made me feel safe and respected, and the results were delivered quickly and privately. Definitely recommend if you value confidentiality.

MichelleD-11

21 February 2024

I can't express enough how pleased I am with the Private Walk-in Clinic. As someone who values privacy and comfort, this clinic hits all the marks. The waiting areas are designed for relaxation, and the staff ensures confidentiality at every step.

Anonymously

4 December 2023

The Walk-In Clinic in central London exceeded my expectations in every way. Their attention to detail and commitment to tailored care for their patients truly sets them apart. The availability of evening appointments until 6:30 pm was a game-changer for someone like me juggling multiple commitments.

LunaW23

14 May 2021

They are so fast. One call and I am there in a few hours, always the same team and so polite and nice.

JuliaSf

14 October 2020

I hope these guys open up again soon because I really cannot stand anyone else around here. they were perfect for me for tests and consultations whenever I needed them

Emily-M

2 August 2019

i have used these guys many times in the last 6 years and its always very fast and professional. most tests are done in 24hours and they call you to explain the results. recommended if you gp (like mine) gives you an appointment in 4 weeks time.

Blood Test Biomarkers

pricing

C-Peptide Blood Test

Helps diagnose diabetes
Differentiates type 1 and type 2 diabetes
Monitors insulin production

see other blood tests

Comprehensive Blood Profile

£79

Platinum Blood Profile

£229

Book Your Blood Test Today

We offer a wide range of private blood tests in London. Same-day appointments are available 5 days a week.

Specialist Medical Team

We work with experienced consultants & healthcare professionals who have received positive feedback from our patients, and with whom we have established long-term relationships.

Amin Ali

Medical Associate

Dr Heather Craig

General practitioner (GP)

Dr Kate Soffer

General practitioner (GP)

Dr Mohammad Mohseyni

Senior General practitioner

Dr Oluwaseyi Kayode

Medical Associate

Juhina Chameseddin

Medical Associate

Our Clinics

City Of London

Harley Street

fAQ

What does C-Peptide measure in the body?

C-Peptide measures the amount of insulin your pancreas is producing by assessing the by-product formed when proinsulin is broken down.

Why is the C-Peptide test done?

This test is used to evaluate insulin production and distinguish between type 1 and type 2 diabetes, as well as to monitor insulinoma or other pancreatic conditions.

What do high C-peptide levels mean?

High C-peptide levels mean your body is making more insulin than usual. This can happen if you have type 2 diabetes or insulin resistance, where your body does not use insulin properly, so your pancreas works harder to make more. Being overweight can also cause this extra insulin production. Sometimes, a rare tumour called an insulinoma can make too much insulin. Also, if your kidneys are not working well, they may not clear C-peptide from your body properly, causing levels to stay high.

What do low C-peptide levels indicate?

Low C-peptide levels mean your body is not making enough insulin, which helps control blood sugar. This often happens in type 1 diabetes (about 8% of diabetes cases) when the immune system destroys insulin-producing cells. It can also occur in advanced type 2 diabetes (seen in 25–30% of long-term cases), after pancreas removal, or due to autoimmune damage. Another cause is using too much injected insulin, leading to low blood sugar.

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