Vitamin D Blood Test
£99
Excellent 4.9 Rating
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Biomarkers Included with the Vitamin D Blood Test blood test
Scroll down for more information about each biomarker
Vitamin D (25 OH)
Why choose us for your Vitamin D Blood Test
About the Vitamin D Blood Test blood test
The vitamin D blood test is a quick, private, and reliable way to assess your vitamin D status, which is crucial for bones, muscles, and overall health. Early detection of deficiency allows timely intervention to improve wellbeing.
Our vitamin D blood test is used to check levels of vitamin D in your blood. Vitamin D plays a vital role for keeping your bones and teeth healthy, and plays a role in immune function, mental health, and muscle function.
What is Vitamin D
Vitamin D is a fat-soluble vitamin. It is also known as the sunshine vitamin because we produce most of what we need through exposure to the sun.
Vitamin D also comes from food, however, it is difficult to get all your requirements from food alone. Sources of vitamin D include oily fish, mushrooms, egg yolks, and vitamin D-fortified foods.
If you have low Vitamin D this can be easily treated with supplements before it causes health problems. If you have a known bone disorder or a problem absorbing calcium, a vitamin D test may be used to see if a lack of vitamin D is causing your condition.
About the Vitamin D Blood Test
The vitamin D blood test measures the level of vitamin D (25-hydroxyvitamin D) in your bloodstream.
Vitamin D is essential for:
- Healthy bones and teeth (it helps the body absorb calcium and phosphorus)
- Proper immune system function
- Muscle strength and overall wellbeing
Vitamin D can be obtained from sunlight, diet, and supplements. Deficiency is common, especially in the UK where sunlight exposure is limited during winter months.
Why is the Vitamin D Blood Test Performed?
A vitamin D blood test may be recommended if you experience:
- Persistent fatigue or low energy
- Muscle weakness or bone/joint pain
- Frequent illness or infections (due to immune system support role)
- Risk factors for deficiency, such as limited sun exposure, darker skin, older age, or certain medical conditions (e.g., osteoporosis, kidney disease)
- Monitoring after starting vitamin D supplementation to ensure levels are adequate
What Do the Results Mean?
Reference ranges vary slightly between laboratories, but broadly:
- Low vitamin D: may indicate deficiency; supplementation or lifestyle changes could be recommended
- Normal range: sufficient levels for bone and immune health
- High vitamin D: uncommon but can occur with excessive supplementation and may need further investigation
Important: Results should be interpreted alongside your symptoms, medical history, and any other relevant tests.
How is the Test Performed?
The vitamin D blood test is a standard venous blood test:
- A small needle is inserted into a vein in your arm to collect blood
- The site is cleaned, and a plaster is applied afterwards
- Most people experience only mild discomfort, and you can resume normal activities immediately
Important Notes
- The Vitamin D blood test is not a diagnostic test for any specific disease—it assesses vitamin D status only. Results should always be interpreted in the context of your full medical history, symptoms and, where required, additional investigations.
- Our services support general health screening and information provision. They do not substitute for advice given by your GP or specialist.
Biomarker information for Vitamin D Blood Test blood test
Vitamin D is actually a hormone which is activated by sunshine on your skin. Vitamin D is essential for bone strength as it helps your intestines absorb calcium. However, it is thought that vitamin D also plays an important role in immune function, as well as in many chronic diseases and mental health.
Many people in the UK have low levels of vitamin D with symptoms including muscle weakness, mood swings and fatigue. People who have dark skin, as well as those who don’t spend much time outdoors are particularly at risk of low vitamin D.
Our Reviews
What does the Vitamin D Blood Test blood test involve?
This blood test is just like a standard blood test.
You will be asked to uncover you left or right arm and suitable vein is found. A tourniquet will be placed and tightened around your upper arm allowing the veins to swell and a needle will be placed into your vein. A small quantity of blood is then drawn into tubes. Once the procedure is complete a small plaster will be placed onto the site which can be removed after a few hours.
How do I prepare
- The blood test requires access to the area of interest, therefore, it is recommended to wear loose clothing to facilitate this process.
- Supplements: If you take vitamin D supplements, your clinician may advise you to pause for a short period before the test
- Wear clothing with sleeves that can be easily rolled up for the blood draw
- If you are unsure about the preparation, please contact us for further information.
How to find us
We pride ourselves on providing the best quality service we can which is why we are trusted by GP's, doctors, physiotherapists, midwives and many other healthcare professionals.
Our mission of better quality healthcare for everyone is at the heart of everything we do and drives us to do the best we can for each and every patient that we see. Our team of experts have years of experience and are fully registered and regulated meaning you are in safe hands with us.
Vitamin D Blood Test FAQ's
Important Notes
- We may require details of your GP / Health Care Professional before or at the time of the test.
- Our London East clinic is located on the first floor, up one flight of stairs. Please note that we don’t have a lift available at this location.
- Blood results require interpretation. All results should be interpreted by your regular health care professional / GP.
- All of our first-line tests are optional and provided on a self-referral basis. You must be aged 16 years or over to use this service. If you have an existing medical condition, are undergoing treatment, or have any concerns about whether this test is appropriate for you, we recommend that you consult your GP or healthcare professional before booking.
- We kindly ask that you inform us of any specific requirements, reasonable adjustments, cultural considerations, or practitioner preferences before your appointment. Whilst we will make every reasonable effort to accommodate requests, this may not always be possible at short notice or subject to staff availability.