Build your own
Build your own test that's specific to your health needs, choosing from our wide range of Biomarkers.
Choose from 30+ markers
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View all tests- Hormones & fertility
- General health
- Nutrition
- Sexual health
- Cancer test
- Mental health
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View all tests
Hormones & fertility 
General health 
Nutrition 
Sexual health 
Cancer test 
Mental health 
Sports Build your own
Build your own test that's specific to your health needs, choosing from our wide range of Biomarkers.
Choose from 30+ markers
Blood Tests for Tiredness & Low Energy
Get to the bottom of low energy or constant feelings of tiredness with our at-home and at-clinic blood tests.
Our blood tests focus on key fatigue-related nutrients and hormones, including iron, Vitamin D, and Vitamin B12. Deficiencies in these nutrients are common causes of persistent tiredness and can be easily checked with a quick blood test. We also offer tests for thyroid function, as imbalances in thyroid hormones (like TSH, T3, and T4) are known to contribute to low energy. You can also screen for adrenal hormones such as cortisol, which plays an important role in managing stress and sustaining energy throughout the day.
Each test comes with clear instructions and access to easy-to-understand results, helping you get one step closer to understanding and managing your energy levels. Choose the test that best suits your needs and start your journey to feeling revitalised and informed about your health.
Build your own
Build your own test that's specific to your health needs, choosing from our wide range of Biomarkers.
Choose from 30+ markers
Tiredness & Fatigue Blood Test
Results in 2 working days
Tired all the time, exhausted, or fatigued? Our test checks thyroid function, along with key vitamins that contribute to energy production.
6 Biomarkers
£ 85
Or 3 interest-free payments of £ 28.33
Advanced Energy Blood Test
Results in 2 working days
Our Advanced Energy Blood Test checks a more comprehensive range of biomarkers to help indentify or rule out causes of low energy.
23 Biomarkers
£ 137
Or 3 interest-free payments of £ 45.67
Baseline Blood Test
Results in 2 working days
A general health blood test that checks bone health, heart, liver and energy levels, and nutrition.
25 Biomarkers
£ 115
Per test
Flexible subscription - Cancel anytime
Nutrition & Vitamin Deficiency Blood Test
Results in 2 working days
Looking to improve your diet and get a better understanding of your overall health and nutrition? Nutricheck home blood test can help.
14 Biomarkers
£ 109
Or 3 interest-free payments of £ 36.33
Ferritin Blood test
Results in 2 working days
If you're feeling tired all the time and low on energy you could be suffering from low iron levels. Check with our ferritin blood test.
1 Biomarker
£ 41
Vitamin B12 Blood Test
Results in 2 working days
Check if your low energy and fatigue could be due to a lack of vitamin B12 with our Active B12 home blood test.
1 Biomarker
£ 50
Or 3 interest-free payments of £ 16.67
Ultimate Health Check
Results in 15 working days
Advanced health test that checks heart, liver, kidney, thyroid, and muscle function, nutrition, immune health, hormones and more.
47 Biomarkers
£ 399
Or 3 interest-free payments of £ 133
Female Hormone Imbalance Blood Test
Results in 2 working days
This single-day test gives a simple snapshot of your key female hormones along with thyroid function.
11 Biomarkers
£ 89
Or 3 interest-free payments of £ 29.67
Male Hormones Blood Test
Results in 2 working days
Our male hormones test checks key health markers that could be causing low energy, mood changes and loss of sex drive.
12 Biomarkers
£ 89
Or 3 interest-free payments of £ 29.67
Anaemia Blood Test
Results in 2 working days
Our anaemia home blood test will help identify if symptoms of low energy and fatigue could be due to deficiencies in iron, vitamin B12 or vitamin D.
9 Biomarkers
£ 99
Or 3 interest-free payments of £ 33
Vitamin D Blood Test
Results in 2 working days
Do you often feel tired or rundown? These could be signs of a vitamin D deficiency. Check your vitamin D levels with our home blood test.
1 Biomarker
£ 50
Or 3 interest-free payments of £ 16.67
Advanced Thyroid Blood Test
Results in 2 working days
Test thyroid function and check for thyroid autoimmune conditions with our advanced thyroid blood test.
5 Biomarkers
£ 69
Or 3 interest-free payments of £ 23
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How can blood testing help?
Knowing why you’re feeling tired can help you create a plan to get back to normality. Whether it’s changing your diet, exercising more (or less, in some cases) or addressing hormone imbalances, blood tests give you the answers. Forth blood tests can be done at home or at a clinic, making them a convenient option for taking control of your health. All our tests are analysed at NHS labs and results are viewable in our app.
What causes low energy?
Low energy can result from a variety of physical, mental, and lifestyle factors. Common causes include nutrient deficiencies, like low levels of iron, Vitamin B12, or Vitamin D. Hormonal imbalances, especially in thyroid and adrenal hormones, can also lead to fatigue by disrupting metabolism and stress response. Other medical conditions, such as anaemia, diabetes, and chronic fatigue syndrome, as well as poor sleep, high stress, and an inactive lifestyle, can further drain energy levels.
Why is it important to address fatigue?
Persistent low energy can affect physical and mental well-being, leading to difficulties with focus, mood swings, and decreased productivity. Long-term fatigue may increase the risk of mental health issues, such as depression and anxiety, and can even worsen chronic health conditions. By tackling the causes of fatigue, you can improve your daily energy, maintain better mental and physical health, and prevent further health complications. Addressing fatigue can lead to lasting improvements in quality of life.
What's included in our tests?
Blood sample kit
Results within 2 working days
Tracked 24 delivery & return
Secure health dashboard
NHS lab analysis
Doctor reviewed results
Certified for quality & security
How it works
Getting the insights you need to improve your health has never been easier.
1. Collect your blood sample
It takes 5 minutes to collect a small sample of blood from your finger tip. Post it back to our labs using the Tracked-24 envelope included in your kit.
2. View your results
Your will receive your Results within 2 working days in the Forth app, along with the optional doctors comment and detailed report.
3. Make improvements
The detailed report makes it easy to identify areas that need improving, make changes and track your progress.