Weight Loss Blood Test

4.5/5

A private weight loss blood test checking 11 markers that can make weight hard to shift or explain unexpected weight change: thyroid (TSH), HbA1c, cholesterol and triglycerides, testosterone, cortisol, iron and inflammation (hs-CRP). From £99 at one of 200+ Goodbody clinics or £119 with a nurse home visit, no GP referral needed. Book a morning appointment. Results are emailed in 3 to 5 working days with a GP report included.... Read more

A private weight loss blood test checking 11 markers that can make weight hard to shift or explain unexpected weight change: thyroid (TSH), HbA1c, cholesterol and triglycerides, testosterone, cortisol, iron and inflammation (hs-CRP). From £99 at one of 200+ Goodbody clinics or £119 with a nurse home visit, no GP referral needed. Book a morning appointment. Results are emailed in 3 to 5 working days with a GP report included.

Key facts

Price: £99 in clinic, £119 nurse home visit
Measures: 11 markers: thyroid stimulating hormone (TSH), HbA1c, total cholesterol, HDL, LDL, cholesterol to HDL ratio, triglycerides, testosterone, cortisol, serum iron and high-sensitivity CRP
Two ways to take it: a venous blood draw at one of 200+ UK clinics, or a nurse who visits your home
Results: 3 to 5 working days from your sample reaching the laboratory
Preparation: book a morning appointment and fast for 8 to 12 hours beforehand; cortisol is best measured before 10am and triglycerides need a fasting sample
You receive: your 11 results with reference ranges and a GP report explaining what they mean for your weight and health

Your questions answered

Why can't I lose weight?

For most people the answer is energy balance, sleep and stress, but a handful of medical conditions genuinely make weight loss harder and are easy to miss: an underactive thyroid, insulin resistance or pre-diabetes, high cortisol, low testosterone in men, and iron deficiency that drains the energy to exercise. This test checks all of them in one sample. Polycystic ovary syndrome (PCOS) is another common cause in women and has its own test.

What blood tests should I have for weight loss?

The useful set is thyroid function, HbA1c for blood sugar, a cholesterol profile, cortisol, testosterone, iron and an inflammation marker, which is exactly what this test contains. Together they show whether a hormone, metabolic or inflammatory problem is working against you, and they give a baseline to measure change against. Repeating the test after three to six months shows whether your weight loss is also improving your blood sugar, cholesterol and inflammation.

What does this test check, marker by marker?

Marker	What it tells you
TSH	Whether your thyroid is underactive, which slows metabolism
HbA1c	Your average blood sugar over 2 to 3 months; pre-diabetes and diabetes
Cholesterol, HDL, LDL, ratio, triglycerides	Heart and stroke risk linked to weight
Testosterone	Low levels in men reduce muscle and raise fat
Cortisol	The stress hormone; persistently high levels favour abdominal fat
Iron	Low iron causes fatigue that undermines activity
hs-CRP	Low-grade inflammation, which is raised in excess weight and falls as it comes off

Is there a test for my metabolism?

There is no single blood marker for metabolic rate, but the two that matter most are thyroid function and HbA1c. An underactive thyroid slows metabolism measurably, and rising HbA1c shows insulin resistance, the state in which the body stores energy readily and burns it reluctantly. Both are in this test. Cortisol and testosterone complete the picture, because both shift where and how easily the body stores fat.

What blood tests are done for unexplained weight loss?

Unexpected weight loss without trying is a different question from difficulty losing weight, and should be discussed with a GP promptly. The tests a GP would run overlap with this one, particularly thyroid (an overactive thyroid causes weight loss) and HbA1c (new diabetes can too), and they would add a full blood count, liver and kidney function and inflammatory markers. This test is a useful starting point, but see your GP rather than relying on it alone.

Do I need to fast before this test?

Yes, ideally. Fast for 8 to 12 hours, drinking only water, and book a morning appointment. Fasting gives an accurate triglyceride result, and a morning sample matters for cortisol, which is naturally highest early in the day and falls through the afternoon. Take your usual medication unless your GP has advised otherwise.

How much does a weight loss blood test cost?

A private weight loss blood test costs £99 at a Goodbody clinic or £119 with a nurse home visit. Both include laboratory analysis of all 11 markers and a GP report. This test needs a venous sample, so there is no finger-prick home kit.

Where can I get this test near me?

At any of Goodbody's 250+ partner clinics across the UK, usually within a few days, or with a nurse who comes to your home to take the sample. No GP referral is needed. Find your nearest clinic.

What happens if a result is abnormal?

Your GP report explains it and says what to do. A raised TSH, HbA1c in the pre-diabetes range or high cholesterol are all treatable and the report will direct you to your GP for confirmation and care. If everything is normal, you have ruled out the medical causes of stubborn weight and can focus on the lifestyle side with confidence, and you have a baseline to repeat against.

What happens next

Your results and GP report are emailed to you within 3 to 5 working days of your sample reaching the laboratory. The report explains each marker in plain language, flags anything outside the reference range and says what to do next, including when to take the result to your own GP. All samples are analysed by a UKAS-accredited laboratory.

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Venous Sample
GP Report Included
11 Key Biomarkers Tested
250+ Clinic Locations
Quick Turnaround of Results

Blood taken by a professional in-clinic Collection Method £99 Visit one of our clinics to have blood taken from your arm from a healthcare professional

250+ Clinics Nationwide

Book a home nurse visit to have your blood sample taken Collection Method £119 Choose 3 preferred dates for a Nurse to come to your location at your convenience

Please check coverage with Postcode

Check Availability (Based on location)

What biomarkers do we test?

How our tests work

Book online...

Book online, receive your kit and take to your local Goodbody clinic.

Send it back…

Send your sample in the post to be analysed at an accredited laboratory.

Get results.

Get your comprehensive detailed results report from the laboratory, with guidance from our support team.

Available testing locations for Weight Loss Blood Test

Aberdeen Clinic GCI Advanced Aesthetics Abergavenny Clinic Amatsu Centre Airdrie Clinic Amiry & Gilbride Pharmacy Aldershot Clinic Wellington Pharmacy Alton Clinic Four Marks Pharmacy Andover Clinic Dr Malaika Clinics Anniesland Clinic Amiry & Gilbride Pharmacy Arlesey Clinic Waterloo Farm Wellness Armadale Clinic Dears Pharmacy Ascot Clinic Ascot Pharmacy AshbyDeLaZouch Clinic Aeternum Aesthetics Ashford Clinic Breakspear Pharmacy Aveley Clinic Doctor B Aesthetics Aylesbury Clinic Aura Body Clinic Aylesbury Clinic Pearlfect Care Pharmacy Aylsham Clinic North Norfolk Ear & Skin Care Ballingry Clinic Barnet Clinic Co Wellbeing Find More

More Information

Who should take this test?

This test is ideal for:

Individuals struggling with stubborn weight gain or resistance to weight loss.
People starting or currently on a weight loss injection programme.
Anyone experiencing symptoms such as fatigue, low energy, slow metabolism, mood changes, or cravings.
Those with a history of metabolic conditions (like insulin resistance, thyroid disorders, or high cholesterol).

Why should I take this weight loss blood test?

Weight loss isn’t just about diet and exercise – your body’s internal chemistry plays a huge role. Hormonal imbalances, chronic inflammation, poor blood sugar control, and metabolic sluggishness can all make weight loss harder.

Taking this test helps you:

Identify underlying issues that may be hindering your progress.
Customise your weight loss strategy, including medication dosing, nutrition, and lifestyle.
Track improvements as your programme progresses.
Improve your chances of achieving sustainable, long-term results.

What do results tell you?

Your results will reveal:

Whether hormones like cortisol, testosterone, and thyroid hormones are helping or hurting your weight loss efforts.

How well your body manages blood sugar and inflammation — two key factors in metabolic health.
Your lipid profile, showing whether your cholesterol levels are within a healthy range.
If you have potential nutritional deficiencies (like iron) that could be contributing to fatigue and reduced performance.These insights allow you and your healthcare provider to make smarter, more effective decisions around your treatment plan.

Biomarkers explained

1. Cortisol
A key stress hormone. High levels can trigger fat storage, especially around the midsection, and impact sleep and metabolism.

2. HbA1c
Reflects average blood sugar over 2–3 months. Raised levels suggest insulin resistance or diabetes risk — both linked to weight gain.

3. HsCRP
An inflammation marker. Chronic inflammation can slow metabolism and increase fat storage.

4. Iron
Low iron causes fatigue and reduced exercise capacity — making weight loss more difficult.

5. Testosterone
Supports muscle, energy, and fat metabolism. Low levels can lead to fat gain and low motivation.

6. TSH (Thyroid Stimulating Hormone)
Regulates thyroid function. Imbalances can affect metabolism and energy.

7. Free T4 (Thyroxine-Free)
The active thyroid hormone. Low levels may signal a sluggish metabolism.

8. Lipid Screen
Measures cholesterol and triglycerides. Imbalances may point to poor fat processing and higher metabolic risk.

9. Non-HDL Cholesterol
Captures all “bad” cholesterol types. High levels are linked to heart and metabolic disease.

Want to get started on your weight loss journey? Find out more about how you can get going here.

How our blood tests work

Have your blood taken in-clinic by one of our skilled phlebotomists and check multiple biomarkers in one go. Many of our tests can also be done in the comfort of your own home with one of our easy-to-use test kits.

Home tests

Clinic tests

Testing

Take a test, either in the comfort of your own home, with a nurse visit, or at one of our clinics nationwide.

Analysis

Your sample is analysed in the clinic, laboratory or using your home test equipment.

Results

Get your comprehensive detailed results report from the laboratory.

Our customers love us!

Excellent service

I was seen immediately on arrival and taken straight in for my procedure. The premises were clean and well maintained, and the staff were polite, professional, and very efficient.

Sophie

Results back within 24 hours

I wanted to have a blood test after a previous HbA1c result showed I was in the diabetic range. I had made some lifestyle changes about a month earlier and wanted to check my progress, but my doctor wasn’t able to retest for another two months, so I decided to arrange my own test. Goodbody made the whole process very easy and convenient, with straightforward booking and quick service. I received my results within few days, and my levels had improved, which was really encouraging and motivated me to keep going. It was well worth the cost.

James. S

Sent off for 24hour heart monitor

I ordered a 24-hour heart monitor kit on Friday and had the results by the following Tuesday. The level of service was excellent, especially given the current one-year wait for an NHS Holter monitor in our area!

Grace Lee

Got the PSA results next day

I completed the PSA test with the PSE EpiSwitch Prostate Cancer test in Soho yesterday and posted my samples at Soho Square at 10:30 am. I received my PSA results the very next day—outstanding service! Despite a BRCA genetic mutation, I am happy to report that I am cancer-free. Thank you, EpiSwitch. 5 stars!

Wilson. P

Someone from Goodbody called me to put my mind ease

I recently had a full blood count taken by a very friendly nurse at Superdrug. She completed all my paperwork for me and was incredibly kind. I received my results the next day. Because of my anxiety and having never seen a lab report before, I emailed for some clarification, and to my surprise, someone from Goodbody called me to put my mind at ease. I’m very grateful for the excellent service and will definitely be using them again.

Michael. T

Understanding of my fear of needles

The nurse was incredibly helpful and understanding of my fear of needles, providing constant reassurance and guiding me through the entire process to help take my mind off what was happening.

Illy. C

Definitely recommend

The team was friendly and professional, making the experience completely painless. The clinic was easy to find, with convenient parking available nearby.

Martin. K

You’re in good hands

I visited the clinic for a private blood test and was immediately impressed by the service. They offer a wide range of services, everything feels high quality and professional, and Emma, who attended to us, was fantastic! Whatever service you book here, you can be confident you’re in very capable hands.

Robert

Top notch experience

As someone who regularly needs blood tests due to diabetes, I can honestly say this was the first time I experienced absolutely no pain at all with the needle—truly none! There was also no bruising afterward. It was a really top-notch job and made for an excellent overall experience (something I’ve never said about a blood test before!).

Ashley. P

Friendly and relaxing atmosphere

I found the staff to be friendly, approachable, and highly professional. They explained everything clearly as they carried out the blood draw. The clinic was clean and thoughtfully set up to help patients feel at ease.

Lorra. L

Polite and efficient approach

I was impressed by the company’s focus on clear communication and professionalism. The procedure was quick, well-organised, and ran smoothly with no unnecessary waiting or confusion. I especially appreciated their gentle approach and how they put me at ease, which was reassuring since it was my first blood draw at the clinic.

Simon. S

Amazing service including nurse coming

Outstanding service, including a nurse visiting my home for blood work. Full body scans through Well Man and Well Woman were arranged within three days, including additional scans and tests which i had requested. All organised within two days and delivered directly to my home. Truly convenient and efficient service!

Andrew. B

Made a dreaded blood test so much easier

I had been feeling unwell for three years and had numerous blood tests through my doctor with no clear answers. I decided to try Goodbody Clinic and ordered an at-home menopause test. The results revealed that I have a low thyroid TSH level, and I am so relieved that this issue was finally identified.

Charlie. T

Truly fantastic local service!

From start to finish, the service was exceptional. Booking the appointment was straightforward, and the entire experience was well-organized and impressively quick.

Dmitry. R

Results less than 24 hours later

Even though I arrived at the clinic a few minutes early, I was seen immediately. I received my blood test results in less than 24 hours. Truly brilliant service!

Malti

Not sure if this test
is right for you?

Enquire via the form and a member of our team will get back to you, they are more than happy to help answer your questions and talk through the best option for you.

Contact us if you aren't sure, we'd be happy to help!

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Experts you can trust

Meet our Goodbody Experts

Our team of professionals has decades of experience so you can be sure you’re getting the best tests and support to understand and improve your health.

Get in touch with Our Team

Dr Lebeth Jacob

BSc (Hons) MBChB
Registered GP & Lead Medical Advisor

Dr Alexandre Akoulitchev

MA, PhD, FRSM
Clinical Support Advisor

Dr Cheng Boon

MBCHB, MRCP, FRCR
Consultant Oncologist

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AFTER YOUR TEST

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We promise to deliver affordable testing to everybody.

When you’re worried about your health, life can feel very stressful, especially if you don’t have the answers you need. We believe that health testing should be available to all, giving you answers when and where you need them.

That’s why we’ve partnered with Splitit, Dopple and Clearpay so you can pay for your tests in interest-free instalments, if you prefer.