Feeling constantly drained, struggling with low energy, or experiencing brain fog? This test checks for common causes of fatigue, including iron deficiency, vitamin D deficiency, and thyroid conditions.




Tiredness and Fatigue Blood Test
- Results estimated in 3 working days
- Convenient testing options
- Bespoke doctor’s report
- Free delivery
Includes iron status, vitamin D, TSH, and T4. For a deeper investigation into fatigue symptoms, consider our Advanced Tiredness and Fatigue Blood Test
How do you want to take your sample?
Please choose one option below-
Collect your own finger-prick blood sample at homeFreeWe’ll send you everything you need to collect your blood sample from your finger at home.
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Book a venous draw at a clinic Venous+£35Visit one of our national clinic partners for a nurse to take your venous blood sample from a vein in your arm. We’ll email you instructions on how to book after we’ve processed your order.
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Book a venous draw at home with a nurse Venous+£59Book a home nurse appointment for a nurse to take your venous blood sample from a vein in your arm.
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Self-arrange a professional sample collection VenousFreeMake an appointment at a phlebotomy clinic to have your venous blood sample taken. You will be responsible for arranging your appointment and any additional fees.
18+ Only. T&Cs apply.
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Go beyond the numbers
Get ready to elevate your health understanding with a personalised doctor's report. Go beyond results and tap into expert insights tailored just for you.
- Actionable advice
- Expert support
- Tailored recommendations

How it works
You have the flexibility to choose what works best for you. Enjoy the comfort of having a friendly nurse visit your home for a quick blood draw, opt for a convenient visit to one of our nationwide partner clinics, or self-arrange a draw at a location that suits you.
Take control of your health with Medichecks – order your blood test today!

Track, improve, and monitor your health over time.
MyMedichecks is your personal online dashboard where you can view your results, access clear and simple explanations about individual health markers, monitor changes in your health, and securely store information about your medical history, lifestyle and vital statistics.
Supported by a team of specialist and qualified doctors
Dr Natasha Fernando
Medical DirectorDr Tina Ghela
Digital Clinician LeadDr Susanna Hayter
Digital Clinician
What's in the test?
Inflammation
hs-CRP
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Iron status
Iron
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TIBC
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Transferrin saturation
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Ferritin
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Thyroid hormones
TSH
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Free thyroxine
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Vitamins
Vitamin D
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Despite its name, vitamin D is actually a hormone that’s produced by your skin when it’s exposed to sunshine. Before your body can use vitamin D produced by sun exposure (known as vitamin D3), it must be converted into another form called 25 hydroxycholecalciferol (25 OH). Vitamin D (25 OH) is the major circulating form of vitamin D, and so your vitamin D (25 OH) level is considered the most accurate indicator of vitamin D supply to your body.
Vitamin D is essential for healthy bones and teeth, as it helps your body absorb calcium. It also plays a role in muscle health, immune function, and mental health.
Low vitamin D symptoms include muscle weakness, mood swings, and fatigue. Many people in the UK have low vitamin D levels, and people with dark skin and people who don’t spend much time outdoors are particularly at risk.
Small amounts of vitamin D can be obtained from food, especially oily fish, eggs, and vitamin-D fortified foods. But if you have a vitamin D deficiency, you’re unlikely to be able to improve your levels by food alone.
How to prepare for your test
Prepare for your Tiredness and Fatigue Blood Test by following these instructions. Take your sample between 6am and 10am. Take this test when any symptoms of short-term illness have settled. Take your sample at least 24 hours after any vitamin or mineral supplements. Do not take biotin supplements for two days before this test, discuss this with your doctor if it is prescribed. If you take thyroxine, you can take your medication as usual, either before or after your blood test. However, if you take desiccated thyroid extract (DTE) or liothyronine, it's best to take it after you've collected your sample. Please let us know in your supporting information if you take amiodarone or lithium as these can affect your thyroid function results.
Test limitations
Reviews
FAQs
What is a Tiredness and Fatigue Blood Test?
Our Tiredness and Fatigue Blood Test investigates three causes of low energy and fatigue: iron deficiency anaemia, underactive thyroid, and low vitamin D, all of which can be improved through supplements or medication.
Who can take a tiredness blood test?
Our test can help if you're feeling tired all of the time and want to find out whether there is a medical reason behind your symptoms. Alternatively, you can use this simple, home finger-prick test if you've taken steps to improve your iron and vitamin D and want to check your levels.
What can cause tiredness and fatigue?
Most people experience fatigue and tiredness from time to time. It is one of the most common reasons why people visit their doctor. Tiredness is often a result of a recent virus or infection or sometimes simply from doing too much. However, for some people, a lack of energy becomes chronic and everyday tasks become more and more difficult.