At-Home Vitamin D Blood Test Kit (UK) Deficiency Check
Regular price
£29.99
Sale price
£29.99
Regular price
£44.00
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Find out what your vitamin D levels are by simply collecting blood using this finger-prick kit and sending the sample to the lab for processing. The report will be quantitative, including actual figures and remarks for any results that fall outside the normal range.
For a Vitamin D test, it's important to avoid taking Vitamin D supplements for at least 1-2 weeks before the test. This period without supplementation is known as a washout period. This allows your Vitamin D levels to return to their natural state, ensuring that the test results accurately reflect your body's Vitamin D status.
Biomarkers
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Vitamin D (25-hydroxyvitamin D)
Vitamin D is an essential nutrient that helps regulate calcium and phosphate levels in the body, supporting healthy bones, teeth, and muscle function. It also plays a role in immune system regulation. Most vitamin D is produced in the skin through sunlight exposure, with smaller amounts obtained from diet and supplements. Low levels are common, especially in the UK during autumn and winter, and may lead to symptoms such as fatigue, muscle weakness, or bone discomfort.
Frequently Asked Questions
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What is vitamin D?
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Vitamin D is a fat-soluble vitamin that acts more like a hormone than a traditional nutrient. It is produced naturally by the skin when exposed to sunlight and can also be obtained in smaller amounts through certain foods and supplements. It plays a vital role in many functions throughout the body and is one of the most commonly deficient nutrients worldwide.
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What does vitamin D do?
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Vitamin D is essential for calcium absorption, making it critical for maintaining strong and healthy bones and teeth. It also supports immune system function, muscle strength, mood regulation, and cardiovascular health. Emerging research suggests it may also play a role in reducing the risk of certain chronic conditions, including autoimmune diseases and some cancers.
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What are the symptoms of vitamin D deficiency?
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Vitamin D deficiency can be difficult to identify without a blood test, as symptoms are often vague and gradual. Common signs include persistent fatigue, low mood or depression, muscle weakness or aches, frequent illness or infections, bone pain, and hair loss. In more severe or prolonged cases, it can contribute to osteoporosis in adults and rickets in children.
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What causes vitamin D deficiency?
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The most common cause is insufficient sun exposure, particularly in countries with limited sunlight for much of the year. Other contributing factors include a diet low in vitamin D-rich foods, darker skin tone (which reduces the skin's ability to produce vitamin D from sunlight), obesity, older age, certain medical conditions such as Crohn's disease or coeliac disease, and the use of some medications.
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How does the weather affect vitamin D levels?
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Sunlight is the body's primary source of vitamin D, and specifically UVB rays are required to trigger its production in the skin. In the UK and other northern countries, UVB levels are too low between October and March for the skin to produce any meaningful amount of vitamin D, regardless of how much time is spent outdoors. This is why deficiency is particularly common during winter and early spring, and why supplementation is widely recommended during these months.
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What is the normal range for vitamin D?
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Vitamin D levels are measured as 25-hydroxyvitamin D (25-OH-D) in the blood. General reference ranges are as follows: below 25 nmol/L is considered deficient; 25 to 50 nmol/L is insufficient; 50 to 125 nmol/L is considered optimal for most people; and above 125 nmol/L may indicate excess, which can be harmful over time.
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How can I test my vitamin D level?
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The most accurate way to test your vitamin D level is through a blood test measuring 25-hydroxyvitamin D. This can be done through your GP, a private clinic, or a home finger-prick blood test kit. Testing is recommended if you have symptoms of deficiency, belong to a higher-risk group, or want to check whether your current supplementation is effective.
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Can I have high levels of vitamin D?
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Yes. While vitamin D deficiency is common, it is also possible to have too much, particularly through over-supplementation. Excessively high levels, known as vitamin D toxicity or hypervitaminosis D, can lead to a build-up of calcium in the blood (hypercalcaemia), causing symptoms such as nausea, weakness, frequent urination, and in severe cases, kidney damage. This is why testing before and during supplementation is recommended, especially at higher doses.
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What is the difference between a laboratory blood test and an at-home rapid test?
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A laboratory finger-prick blood test involves posting a small sample to an accredited laboratory, where it is analysed using clinical-grade equipment and returns an exact numerical value of your vitamin D level in nmol/L. A rapid cartridge test gives a result within minutes at home but is less precise, indicating only whether your level is low, adequate, or high rather than an exact figure. For clinical accuracy or to monitor supplementation, a laboratory test is strongly recommended. A rapid test should not be used as the basis for medical decisions without laboratory confirmation.
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Turnaround Time
Turnaround Time
Once your sample is collected and posted, it is processed in our laboratory with a typical turnaround time of 1-3 days from the moment the lab receives the kit.
Test Preparation
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Vitamin D
Fasting: While strict fasting is not required, you must avoid a high-fat meal for at least 6 hours before taking your blood sample. Fatty meals can cause lipemia, a condition where the blood looks cloudy or milky, which may affect the accuracy of your results.
Supplements: If you are taking prescribed vitamin D supplements, please check with your prescriber before testing, as they may advise stopping them 24 to 72 hours before collecting your sample. Recent intake can temporarily elevate levels and may not accurately reflect your true vitamin D status.
Hydration: Drink water as normal before testing, as good hydration can make blood collection easier.
Symptom Check
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Vitamin D Deficiency
Fatigue and low energy
Muscle weakness or aches
Bone pain or generalised body discomfort
Low mood or depressive symptoms
Increased susceptibility to infections
Slow recovery from illness or injury
In more significant deficiency, vitamin D can also contribute to reduced bone density over time, increasing the risk of fractures.
Result Report
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Result Report (in-use)
The final report provides a comprehensive breakdown of your biomarkers, displaying your specific levels alongside standard UK reference ranges to show exactly where you fall on the spectrum. Beyond just the raw numbers, the report includes a brief commentary.
View your results in a clear, easy-to-understand format with charts and reference ranges. If you repeat the same biomarkers with us, your report includes historical comparisons to help track changes, trends, and progress over time.
How it works
Order test online
Collect a few drops at home
Return sample to the lab
