Vitamin D Blood Test London
Vitamin D Blood Test at 117a Harley Street, London, from £108.75, with results in 1 working day. This test measures 25-hydroxy vitamin D, the standard marker used to assess vitamin D status and guide whether supplementation needs review. Laboratory testing starts from £108.75.
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This test measures 25-hydroxy vitamin D, the standard marker used to assess vitamin D status and guide whether supplementation needs review.
Your test option
Select a profile to see every included analyte before you book.
Why measure 25-hydroxy vitamin D?
Vitamin D supports bone and muscle health. A blood test measuring 25-hydroxy vitamin D (25-OH) is the standard way to assess the current vitamin D level and see whether a dose or supplementation plan needs review with a clinician.
At Medical Express Clinic the test is £108.75, with sampling on Harley Street and a report usually ready within 1 working day.
Vitamin D (25-OH)
Vitamin D (25-OH)
VITD · £108.75
Analytes: Vitamin D (25-OH)
Turnaround: Usually 1 working day
- •This test measures 25-hydroxy vitamin D concentration, the circulating form used to assess vitamin D status. It is not a test of calcium, phosphate or parathyroid hormone. Those can be relevant in some clinical situations but are not part of this panel.
Have a doctor review your vitamin D result
A vitamin D level is read with your symptoms, diet, sun exposure and any supplements you take. A private GP can explain the result, advise on a suitable dose and how long to take it, and say when to test again.
A low level does not explain every case of tiredness or aching, so the doctor can also look for other causes.
- •Book a GP consultation first if you are unsure whether vitamin D is the right test
- •The report is usually ready within 1 working day
- •Book a follow-up consultation to go through the result and agree the next step
GP Consultation
£150
Discuss tiredness, bone or muscle aches or a previous low result, and agree whether other tests should be taken with it.
Follow-Up Consultation
£100
For existing patients: go through your result with a doctor and agree the next step.
Only need the laboratory test? Our sister clinic lists the vitamin D test at Blood London.
Who this test helps
Supplementation advice depends on the result, symptoms, diet, sun exposure and other health factors.
- •Bone or muscle symptoms
- •Limited sun exposure
- •Monitoring prescribed supplementation
- •Risk factors for vitamin D deficiency
What to mention before sampling
No routine fasting is required. Mention vitamin D supplements and the dose you currently take when you book.
Sampling at 117a Harley Street usually takes 10 to 15 minutes, with no recovery period afterwards. The report is usually ready within 1 working day.
How to read a vitamin D result
- •The result does not identify why a level is low.
- •Symptoms such as fatigue are not specific to vitamin D deficiency and may need broader assessment.
Usually 1 working day. Your laboratory report is supplied securely.
The blood-test price covers the laboratory report, not a consultation. A separate GP consultation is £150 if you want a doctor to interpret the result with your symptoms and history.
For bone-health concerns that need imaging, bone density screening is a separate assessment. A low vitamin D result alone is not an automatic reason for a scan.
Source: NHS vitamin D guidance.
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Sources & References
- Vitamin D supports bone and muscle health, and supplementation advice depends on individual circumstances. - NHS vitamin D guidance[Link]
Dr Penny Sheehan
Health Screening, Paediatrics and Menopause • GMC 6056535
“Dr Sheehan works in women's health, menopause care and health screening. She has training and experience in weight management, including GLP-1 receptor agonist prescribing, and a special interest in paediatric assessment.”
Service information reviewed 26 August 2026.
What our patients say
“Quick, painless draw and 4-hour results”
“Had an appointment at 1:30 PM but got there early and the staff were happy to draw my blood earlier since there was availability. Quick and painless process with a professional phlebotomist. The turnaround time stated on the website for the test was 4 hours, and sure enough, I received my results super easy with no issues. Would recommend this service.”
“Heard, understood and reassured”
“The clinic is warm and welcoming. In my experience, every time I was there, I found myself heard and understood. My health issues have been tackled in the best of ways. Miss Arjeta is absolutely a master of blood tests, you will not feel anything. Dr Bakhtiar is knowledgeable and calm, I always feel reassured after speaking to him. I genuinely recommend this clinic.”
“Results faster than expected at a walk-in clinic”
“I recently had a blood test for rabbit allergies at Medical Express Clinic, and I'm extremely pleased with the service. Not only did I receive my results faster than expected, but the receptionist was fabulous, she answered all my questions and accommodated all my requests. It's the only walk-in clinic I found in central London with reasonable prices. Highly recommend this clinic!”
Common questions
What vitamin D level is deficient?
The report includes a laboratory reference range. Whether treatment is needed depends on the result, symptoms, current supplements and relevant health conditions. A doctor can interpret the level against those factors.
Should I stop supplements before the test?
Mention the current vitamin D dose when you book. The clinic will say if anything needs to change before sampling.
Can a doctor explain my result?
A GP consultation is £150 when booked separately. It is not included in the test price.
