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Worried about your weight?

Blood tests for weight loss and weight gain

Our range of blood tests will help identify possible causes for weight gain, weight loss, or why you may be unable to shift excess weight if you are trying to.

It can be really frustrating if you are exercising or dieting but not losing weight. This can be due to lots of factors, such as thyroid dysfunction or slow metabolism, hormone imbalance or vitamin deficiency.

You may also be experiencing unexplained weight loss or gain, which can be a result of thyroid dysfunction, Type 2 Diabetes, lack of sleep or insomnia, or depression caused by hormonal changes or external factors.

These possible causes can be checked with simple blood tests to identify your problem and provide recommendations on how to reduce your symptoms.

We recommend...

Thyroid Function blood test

A thyroid disorder or disease, often known as having a slow or fast metabolism, is a common cause of issues with managing weight loss or gain.

Book a test

Other Tests for Weight...

Premium Complete Blood Test

from £249.00
62 Biomarkers
In Clinic Test

Why take this test?

If you are experiencing symptoms or are worried about your health, this test will offer a comprehensive understanding and insight into a range of biomarkers, indicating if there are any points for concern to follow up on with your GP. The test checks for:
  • Thyroid
  • Kidney function
  • Liver function
  • Cholesterol
  • Minerals
  • Diabetes
  • Gout
  • Iron deficiency
  • Hormones
  • Muscle and bone health
 

Why is this test superior to our Advanced Well Man and Well Woman Blood tests?

The Premium Complete Blood Test analyses 62 key health markers compared to the Advanced Well Man and Well Woman Blood Tests which analyses up to 48 key health makers. The Premium Complete Blood Test is our most comprehensive wellness test to date, investigating many areas of concern in much more detail: such as hormones, vitamins, trace metals and muscle and bone health to ensure you have a much more rounded view of your health.

Speak to a Doctor

Discuss your results with a qualified, registered GP at a time that is convenient to you. Simply pay for a GP Consultation when you check out today and we will send you the details of how to arrange your video call - appointments available every day, 8am-8pm. Don't wait weeks to see your GP - our service gives you answers and reassurance when you want them.
  • No hidden fees
  • FREE prescription arrangement*
  • FREE referral letter
  • FREE fit note if needed.
*Prescription charges may apply depending on your NHS eligibility  

Important Information

You are required to fast 8-12 hours before your test.
  • Accredited lab report
  • GP follow up available
  • Results in 3-5 working days
  • UK call centre
Learn more

EpiSwitch PSE Advanced Blood Test

from £905.00
2 Biomarkers
In Clinic Test

Testing Accuracy: PSA Test vs. EpiSwitch® PSE

Testing with a standard PSA Prostate Test results in 55% accuracy in detecting prostate cancer. Testing with EpiSwitch® PSE improves your results to 94% accuracy in detection.
Prostate cancer is a concern for many men. Its risk increases with many factors including: age, family history, genetics and ethnicity. The most common prostate cancer test measures your PSA (prostate specific antigen), a protein produced by your prostate, and by prostate cancer cells which increases as you get older and your prostate increases. However, many men who take the PSA test alone and have results of a raised PSA do not always have cancer. By taking the EpiSwitch® PSE Advanced Blood Test alongside or following a private PSA Test, you can make a better-informed decision about your next steps.  
EpiSwitch Prostate Screening (PSE) Test from Oxford BioDynamics on Vimeo.  

Who should take the EpiSwitch® PSE?

  • Any man who is being screened for, or is concerned about, prostate cancer.
  • You may have already been told you have a high or rising PSA level.
  • You may have trouble urinating, or have other prostate associated symptoms.
  • You may want peace of mind before starting on a prostate biopsy or treatment plan.
 

How does the EpiSwitch® PSE Test work?

The EpiSwitch PSE test uses a small sample of blood to measure 5 vital epigenetic changes in your immune cells, and combines these with your PSA (Prostate Specific Antigen PSA Test) score to boost accuracy. A secure report is returned to our doctors within around 5 days after the lab receives your sample, and they will explain the result to you. A diagram showing EpiSwitch PSE Prostate Cancer screening test benefits Source: † Pchejetski et al. (2023). Circulating CCS Significantly Enhance PSA PPV and Overall Accuracy for Prostate Cancer Detection. Cancers, 15(3), 821. http://dx.doi.org/10.3390/cancers15030821  

What do the results tell you?

Your doctor will receive a personalised EpiSwitch® PSE report informing you if you have a ‘low likelihood’ or ‘high likelihood’ of prostate cancer.
  • A 'low likelihood' PSE result can offer peace of mind and reduce unnecessary biopsies and over-treatment. This result is consistent with the absence of cancer in more than 9 out of 10 men.
  • A 'high likelihood' PSE result can help your doctor immediately refer you to the right next step. This result is consistent with cancer being confirmed in more than 9 out of 10 men.
After receiving your report, our doctors will consider this result along with your history to recommend appropriate next steps.  

Process for the EpiSwitch® PSE Advanced Blood Test

Once you have decided the EpiSwitch® PSE advanced blood test is right for you: Step 1 - Click "book now" and choose to have the sample collect by a professional at home, or in-clinic. Step 2 - Goodbody will send you a test kit to be used at the time of your appointment Step 3 – Receive your test results within 5 working days of the laboratory receiving your sample, showing whether you have a ‘low-likelihood’ or ‘high-likelihood' PSE result.  

Important Information

To book EpiSwitch® PSE test, you must have completed a PSA test within the last 6 months. If you have not done so, you can click here to book a Goodbody PSA test or you can add the PSA test through the checkout process. This test is not available if you have received treatment for Prostate cancer within the last 4 weeks. Goodbody will post to you a specialised testing kit to be used by a qualified professional only.

Concerned about prostate cancer? Find out more about it's symptoms, screening and tests here.

  • Accredited lab report
  • GP follow up available
  • Results in 3-5 working days
  • UK call centre
Learn more

Weight Loss Blood Test

from £99.00
11 Biomarkers
In Clinic Test

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.

  • Accredited lab report
  • GP follow up available
  • Results in 3-5 working days
  • UK call centre
Learn more

NAD Blood Test

from £305.00
2 Biomarkers
In Clinic Test

Measure your NAD levels

The new Blood Test is an easy, at-home kit that helps you check your NAD+ and NADH levels - key molecules involved in energy and cellular health. By knowing your baseline levels, you can make informed and safe decisions about lifestyle choices or supplementation, tailored to your body’s needs. The kit uses advanced technology to provide accurate results from a small blood sample. Results are simple to understand and allow you to monitor your NAD status safely over time, helping you maintain your wellbeing.  

What are NAD and NADH?

NAD (Nicotinamide Adenine Dinucleotide) is a vital molecule naturally produced in the body. It plays a key role in converting food into energy, supporting cellular repair, and maintaining overall metabolic balance. NAD declines as we age, so maintaining healthy levels is crucial for overall health, longevity and slowing 'signs of aging'. NAD supplements have recently become highly popular in the UK - to immediately boost NAD levels - helping to promote overall energy, mental clarity and signs of vitality. NADH is the reduced form of NAD and works alongside to help regulate energy production and cellular functions. Together, NAD and NADH are crucial for maintaining cellular health, ensuring your cells have the energy to function efficiently and repair damage over time.  

Why take the NAD Blood Test?

NAD levels differ widely between individuals depending on factors such as:
  • Age
  • Diet
  • Lifestyle choices
  • Underlying health conditions.
  Testing your NAD provides an accurate baseline, helping to determine whether supplementation or lifestyle changes are appropriate for you. Sustaining healthy NAD levels is vital to ensure you only take on what your body needs.

Extremely low NAD+: May result from chronic illness, poor diet, or mitochondrial dysfunction; medical evaluation recommended.

Extremely high NAD+: Often caused by excessive supplementation; can disrupt metabolic balance and may lead to vascular inflammation.

Extremely low NADH: Could indicate either efficient energy production or severely depleted NAD levels due to vitamin B3 deficiency or mitochondrial dysfunction.

Extremely high NADH: Commonly linked to mitochondrial dysfunction or over-supplementation.

 

What will the NAD Blood Test tell me?

  • Your NAD+ and NADH levels. The test measures both NAD+ (the oxidized form) and NADH (the reduced form) in your blood showing how much energy your cells are producing vs how much they are repairing and regenerating.
 
  • Your NAD+/NADH ratio This ratio reflects your cellular redox balance, which is essential for metabolism, energy production, and overall cell function. A healthy ratio indicates that your body is efficiently converting nutrients into energy and supporting cell repair.
  Normal ranges:
Low High
NAD+ (µM) 20 36
NADH (µM) 0.6 1.8
NAD+/NADH ratio 16.3 45
See a report sample here. Results are not a diagnosis. If your values are outside the healthy reference range, consult a qualified healthcare professional for interpretation and any necessary follow-up.  

How does the blood test work?

The test uses a small sample of your blood, which is processed using NADMED Technology to accurately measure NAD and NADH concentrations. Results provide a clear picture of your cellular energy balance, helping identify potential deficiencies or imbalances. This information can then guide personalised supplementation or lifestyle adjustments. Simply book your blood test at home or in-clinic, and receive your results within 7 working days of the sample being received at the laboratory.  

What is in the kit?

Each kit includes all materials required for sample collection and return. Any licensed nurse can draw the sample using the enclosed instructions. When booking the blood test, you will receive:
  • CE-marked blood collection kit
  • Instructions for taking the sample correctly
  • Pre-paid return packaging to send the sample to the lab
  • Access to your results
 
  • Accredited lab report
  • GP follow up available
  • UK call centre
  • Results in 5-7 working days
Learn more

Advanced Well Woman Blood Test

from £175.00
52 Biomarkers
In Clinic Test
Our most comprehensive blood test for women, including diabetes, cholesterol, organ health, vitamins and minerals, hormones, iron levels and more.
  • Accredited lab report
  • GP follow up available
  • Results in 3-5 working days
  • UK call centre
Learn more

Advanced Well Man Blood Test

from £175.00
49 Biomarkers
In Clinic Test
Our most comprehensive blood test for men, including diabetes, cholesterol, organ health, vitamins and minerals, hormones, iron levels and more.
  • Accredited lab report
  • GP follow up available
  • Results in 3-5 working days
  • UK call centre
Learn more

Thyroid Function with Antibodies Blood Test

from £109.00
5 Biomarkers
In Clinic Test
This advanced thyroid and antibodies blood test looks in detail at your thyroid function, including antibodies, for health concerns and autoimmune conditions.
  • Accredited lab report
  • GP follow up available
  • GP recommended
  • Results in 3-5 working days
Learn more
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The Blue Building, Stubbs Lane, Beckington BA11 6TE
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Goodbody Clinic is a trading name of Goodbody Wellness Ltd.

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