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Vitamins are essential for energy, focus, and long-term health. Even small deficiencies can affect mood, sleep, and performance. A vitamin blood test helps identify which nutrients your body may be lacking so you can make informed decisions about your diet and supplements.
At One Day Tests, our vitamin blood tests make it easy to check your levels from home or at one of our nationwide clinics. Whether you want to understand why you feel tired, check for deficiencies, or track progress after dietary changes, our laboratory-reviewed results provide clear and accurate insights.
WHAT IS A VITAMIN BLOOD TEST
A vitamin blood test measures the levels of key vitamins circulating in your blood. These nutrients support everything from immune function and energy production to skin, bone, and brain health.
Commonly tested vitamins include:
- Vitamin D for bone strength, immunity, and mood balance
- Vitamin B12 and Folate (B9) for red blood cell production and energy metabolism
- Vitamin A for vision and skin health
- Vitamin B6 and B1 for nerve and brain function
- Vitamin B7 (Biotin) for hair, skin, and nail health
Testing your vitamin levels helps detect deficiencies early, preventing long-term health issues and helping you feel more energised and balanced.
VITAMIN D (25-OH) TESTVitamin D is a fat-soluble vitamin essential for maintaining bone health, regulating calcium and phosphorus levels in the body, and supporting immune function. |
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£37.00
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ULTIMATE VITAMINS TESTAll of the essential vitamins to get you going on the vitamin deficiency screening. Tired all the time? Could be the vitamin levels. |
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£80.00
£70.00
SAVE 12%
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VITAMIN B12 TESTThis test is used to diagnose vitamin B12 deficiency, which can lead to symptoms such as fatigue, weakness, neurological problems, and megaloblastic anemia. |
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£69.00
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FOLATE - FOLIC ACID - VITAMIN B9 TESTThis test measures the total level of folic acid (Vitamin B9) in your blood. Folate (B9) breaks down homocysteine in order to create other chemicals your body needs. |
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£45.00
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VITAMIN B6 (PYRIDOXINE) TESTVitamin B6 is essential for various bodily functions, including metabolism, neurotransmitter synthesis, and immune function. |
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£116.00
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VITAMIN A (RETINOL) TESTDeficiency of vitamin A can lead to impaired immune function and other health issues, while excessive intake can cause toxicity and adverse effects. |
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£115.00
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VITALS - BLOOD PRESSURE AND BMI MEASUREMENTSGet your blood pressure and BMI measured at any of our clinics. This should be regularly monitored to ensure longevity and good health, especially the blood pressure. |
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£15.00
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VITAMIN B1 (THIAMINE) TESTThis test is used to assess a thiamine deficiency, which can lead to symptoms such as weakness, fatigue, nerve damage, and cardiovascular problems. |
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£130.00
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VITAMIN B7 (BIOTIN) TESTA vitamin B7 blood test measures the level of biotin (vitamin B7) in the bloodstream, which plays a crucial role in metabolism, cell growth, and fatty acid synthesis. |
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£140.00
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WHY TAKE A VITAMIN BLOOD TEST
Vitamin deficiencies are common, even among people who eat a balanced diet. Factors such as stress, restricted eating, limited sunlight, or poor absorption can all affect your vitamin balance.
You may benefit from a vitamin blood test if you:
- Feel tired, low in energy, or struggle to concentrate
- Have brittle nails, thinning hair, or dry skin
- Experience low mood or poor sleep
- Follow a vegan, vegetarian, or restricted diet
- Want to track improvements after supplement use
Understanding your vitamin profile helps you tailor your nutrition and lifestyle for better energy, performance, and wellbeing.
WHAT TESTS ARE INCLUDED IN THIS CATEGORY
Our vitamin blood test collection includes a selection of single-marker and profile tests designed to give a clear view of your nutrient status.
Our current range includes:
These tests assess essential vitamins involved in energy, mood, immune function, and overall health. Whether you need a general overview or a specific vitamin check, there is a test to suit your needs.
HOW OUR VITAMIN BLOOD TESTS WORK
Testing your vitamin levels with One Day Tests is quick and straightforward. You can choose a home testing kit or visit one of our clinics for sample collection.
1. Select Your Test
Select from our vitamin test range based on your symptoms or goals.
2. Provide Your Sample
Take a finger-prick blood sample at home or book a venous draw in clinic.
3. Get Your Results the same or next day
Access your results within 24 to 48 hours through your secure online dashboard.
All tests are analysed by accredited UK laboratories to ensure clinically accurate results.
UNDERSTANDING YOUR RESULTS AND NEXT STEPS
Your results will show your vitamin levels compared to healthy reference ranges. If any values fall outside the expected range, this may suggest a deficiency or absorption issue.
If your results show low vitamin D, B12, or folate, you can share them with your GP or nutritionist to discuss the best way to correct your levels. In many cases, dietary adjustments or supplements can make a noticeable difference to energy, mood, and immune health.
Many people retest every few months to monitor progress, especially after changing diet, lifestyle, or supplements.
FREQUENTLY ASKED QUESTIONS
What blood test checks all your vitamin levels?
A comprehensive vitamin blood test checks a wide range of vitamins including vitamin D, B12, folate, and other B vitamins. It provides a complete overview of your nutritional balance and helps identify deficiencies early.
Can my GP do a vitamin deficiency test?
GPs can order some vitamin tests, such as vitamin D or B12, but availability may vary depending on your symptoms and local services. Private testing gives faster access and the option to check multiple vitamins at once.
What is a normal B12 level?
A normal B12 level for most adults is generally between 190 and 950 picograms per millilitre (pg/mL), though optimal levels may vary by individual and laboratory. Low levels can lead to tiredness, weakness, or tingling sensations in the hands and feet.
Does a full blood count show vitamin deficiencies?
A full blood count (FBC) can sometimes suggest possible vitamin deficiencies by showing changes in red blood cell size or count, but it does not directly measure vitamin levels. Specific vitamin tests are needed to confirm deficiencies.