Vitamin D Blood Test
Check your vitamin D levels with a simple blood test. This assessment helps you understand if your levels are within a healthy range, and supports your overall wellbeing.
What is a Vitamin D Blood Test?
A vitamin D blood test measures the level of vitamin D in your bloodstream. Vitamin D is essential for maintaining healthy bones, supporting the immune system, and helping your muscles work properly. Low levels can lead to fatigue, weakened bones, and increased risk of illness, while high levels can also cause health issues.
This test provides a clear picture of your vitamin D status and helps your healthcare professional recommend any changes needed to maintain a healthy balance.
Who Should Take a Vitamin D Blood Test?
A vitamin D blood test is useful if you want to confirm your status and guide safe supplementation. It is especially relevant for the groups below:
- Limited sun exposure: indoor work, covering clothing, winter months, or housebound.
- Darker skin tones: higher melanin reduces vitamin D production from sunlight.
- Persistent fatigue or low mood: check whether low levels may be contributing.
- Aches in bones or muscles: including cramp, weakness, or increased fracture risk.
- Perimenopause or menopause: to support bone and muscle health alongside care plans.
- Pregnancy or planning: helps ensure levels are adequate for mother and baby.
- Dietary or absorption factors: vegan or low-dairy diets, coeliac disease, IBD, or post-bariatric surgery.
- Monitoring supplements: if you already take vitamin D and want to avoid over- or under-dosing.
- Abnormal calcium or PTH results: to provide context for further clinical advice.
Always follow the specialist’s guidance on testing frequency and dose.
Your Journey With Us
Experience a streamlined process designed to support you every step of the way:
Initial
Consultation
A consultation, face-to-face or virtual, with a Hormone Health specialist to discuss your medical history, symptoms, and goals.
Personalised
Health Plan
Receive a personalised plan combining diagnostic testing, treatment recommendations, and lifestyle guidance tailored to your needs.
Follow-Up
Review
Reviews to monitor progress and adjust your plan as necessary, ensuring ongoing support.
What Biomarkers Are Measured for a Vitamin D Blood Test?
A vitamin D blood test measures the level of 25-hydroxyvitamin D in your blood. This is the main form of vitamin D circulating in your body and gives a clear indication of whether your levels are sufficient.
Key biomarker includes:
- 25-hydroxyvitamin D (25(OH)D): Shows how much vitamin D is in your blood from sunlight, diet, or supplements. Low levels may increase the risk of weak bones, fatigue, or immune changes, while high levels can result from taking too many supplements.
Understanding Your Vitamin D Blood Test Results
Your vitamin D blood test results show how your 25-hydroxyvitamin D levels compare with expected healthy ranges. This helps your doctor understand whether your vitamin D is supporting your bones, muscles, and overall wellbeing.
- Low 25-hydroxyvitamin D: May indicate a deficiency that could affect bone strength, energy levels, or immunity.
- Within the normal range: Suggests your vitamin D levels are sufficient for overall health.
- High 25-hydroxyvitamin D: Could result from over-supplementation and may require adjustment to avoid potential health effects.
FAQs
Do I need to fast?
No. Vitamin D testing does not require fasting. Hormone Health only asks patients to fast for two specific panels, and you’ll be told in advance if that applies.
Where is the blood taken?
At The Doctor’s Laboratory (TDL) walk-in centre near One Welbeck, not in-clinic at Hormone Health.
When will I get my results?
Typically, within a few days of your blood draw. A specialist reviews them, and we’ll explain findings and next steps in a follow-up.
Can supplements affect my result?
Yes. Tell your clinician about all supplements so your dose and timing can be interpreted correctly.
Is this suitable during perimenopause or pregnancy?
Yes. Monitoring vitamin D supports bone, muscle, and general health. Your clinician will advise on timing and safe dosing.
Ready to Take the Next Step?
Ready to get clear answers from the experts? Book your appointment and take control of your health today.
Please note: A blood test must be booked alongside a consultation with a Hormone Health Specialist to ensure results are interpreted accurately by a clinician.
Price: £127.20
Arrange a virtual consultation or visit us at:
Clinic Address: Hormone Health, One Welbeck, 1 Welbeck Street, London W1G 0AR