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Vitamin blood tests

Private vitamin blood tests to check markers such as vitamin D, vitamin B12 and folate.

Book a GP blood test appointment if you want advice on whether vitamin testing is right for you, or if you want your results reviewed in context.

Vitamin blood tests

Test options

Use the options below if you already know which vitamin test you need. If you are unsure, book a GP blood test appointment and your GP can advise.

1,25 Vitamin D

DocTap Saver price^†

£150.30

Standard £167

Vitamin D (1, 25 Dihydroxy)

Availability All clinics

SampleBlood

Results 9 days You will typically receive your results and report within 9 days. Occasionally samples can need additional testing which is carried out free of charge but can extend the timings.

Calcium + Vitamin D (Venous)

DocTap Saver price^†

£113.40

Standard £126

Availability All clinics

SampleBlood

Results 2 days You will typically receive your results and report within 2 days. Occasionally samples can need additional testing which is carried out free of charge but can extend the timings.

Folate (Red Cell)

DocTap Saver price^†

£63

Standard £70

Vitamin B9 (Folic acid) – Red cell

Availability All clinics

SampleBlood

Results 3 working days You will typically receive your results and report within 3 working days. Occasionally samples can need additional testing which is carried out free of charge but can extend the timings.

Folate (Serum)

DocTap Saver price^†

£63

Standard £70

Vitamin B9 (Folic acid) – Serum

Availability All clinics

SampleBlood

Results 2 days You will typically receive your results and report within 2 days. Occasionally samples can need additional testing which is carried out free of charge but can extend the timings.

Vitamin A (Retinol)

DocTap Saver price^†

£160.20

Standard £178

Availability All clinics

SampleBlood

Results 6 working days You will typically receive your results and report within 6 working days. Occasionally samples can need additional testing which is carried out free of charge but can extend the timings.

Vitamin B (Functional)

DocTap Saver price^†

£149.40

Standard £166

Availability All clinics

SampleBlood

Vitamin B Profile

DocTap Saver price^†

£389.70

Standard £433

Vitamin B1 (Thiamine)

Vitamin B2 (Riboflavin)

Vitamin B3 (Nicotinamide)

Vitamin B6 (Pyridoxine)

Vitamin B9 (Folic acid) – Red cell

Vitamin B12 (Active)

Availability All clinics

SampleBlood

Vitamin B1 (Thiamine)

DocTap Saver price^†

£160.20

Standard £178

Availability All clinics

SampleBlood

Vitamin B12 (Active) (Venous)

DocTap Saver price^†

£81

Standard £90

Availability All clinics

SampleBlood

Results 2 days You will typically receive your results and report within 2 days. Occasionally samples can need additional testing which is carried out free of charge but can extend the timings.

Vitamin B12 (Active)/Red Cell Folate

DocTap Saver price^†

£65.70

Standard £73

Availability All clinics

SampleBlood

Vitamin B12 (Total)

DocTap Saver price^†

£67.50

Standard £75

Availability All clinics

SampleBlood

Results 2 days You will typically receive your results and report within 2 days. Occasionally samples can need additional testing which is carried out free of charge but can extend the timings.

Vitamin B2 (Riboflavin)

DocTap Saver price^†

£160.20

Standard £178

Availability All clinics

SampleBlood

Vitamin B3 (Nicotinamide)

DocTap Saver price^†

£160.20

Standard £178

Availability All clinics

SampleBlood

Vitamin B5 (Pantothenic Acid)

DocTap Saver price^†

£144

Standard £160

Availability All clinics

SampleBlood

Vitamin B6 (Pyridoxine)

DocTap Saver price^†

£160.20

Standard £178

Availability All clinics

SampleBlood

Vitamin C (Active)

DocTap Saver price^†

£160.20

Standard £178

Availability All clinics

SampleBlood

Vitamin D (25-OH) (Venous)

DocTap Saver price^†

£42.30

Standard £47

Availability All clinics

SampleBlood

Results 2 days You will typically receive your results and report within 2 days. Occasionally samples can need additional testing which is carried out free of charge but can extend the timings.

Vitamin E (Alpha Tocopherol)

DocTap Saver price^†

£168.30

Standard £187

Availability All clinics

SampleBlood

Vitamin K (Nutritional)

DocTap Saver price^†

£100.80

Standard £112

Availability All clinics

SampleBlood

Vitamin Profile 1

DocTap Saver price^†

£288.90

Standard £321

Vitamin A (Retinol)

Beta Carotene

Vitamin B1 (Thiamine)

Vitamin B2 (Riboflavin)

Vitamin B6 (Pyridoxine)

Vitamin D (25-OH)

Vitamin E (Alpha Tocopherol)

Availability All clinics

SampleBlood

Vitamin Profile 2

DocTap Saver price^†

£406.80

Standard £452

Vitamin A (Retinol)

Beta Carotene

Vitamin B1 (Thiamine)

Vitamin B2 (Riboflavin)

Vitamin B3 (Nicotinamide)

Vitamin B6 (Pyridoxine)

Vitamin B9 (Folic acid) – Red cell

Vitamin B12 (Active)

Vitamin D (25-OH)

Vitamin E (Alpha Tocopherol)

Availability All clinics

SampleBlood

Test prices are separate from the GP blood test appointment fee (Saver £67.50, standard £75) and a £20 test handling fee. Available tests, prices and turnaround times can vary by clinic and test route.

† The Saver price is available with DocTap Saver — a £15 membership that gives 10% off appointments and tests for 12 months (scans and medications excluded). You can add DocTap Saver to your basket when you book your appointment, or during your consultation when adding tests.

From booking to results

Your appointment, step by step

Book online, see a GP, have your sample taken during the appointment and view your results securely in your DocTap account.

1

Book online in minutes

Choose your preferred clinic and time, and select a male or female clinician where available. You will get instant confirmation.
2

We will tell you how to prepare

Most blood tests do not need fasting. If a test needs anything specific beforehand, we will let you know before your appointment.
3

See a GP and have your sample taken

Your appointment includes a 15-minute GP consultation to discuss symptoms, check suitability or advise which test you need. A quick blood sample is then taken from your arm.
4

Get results and follow-up

You will get a message when your result is ready. Your results and doctor's report will be available securely in your DocTap account; abnormal results are prioritised and your clinician will contact you if urgent action is needed.

Private blood test appointment in London

What it can show

What do vitamin blood tests tell you?

Vitamin blood tests can help check whether common deficiencies may be contributing to symptoms, but they still need clinical context.

Vitamin D

Vitamin D supports bone health, muscle function and wider wellbeing. Low vitamin D is common, especially with limited sun exposure, darker skin, covering clothing, restricted diet or during winter months. A blood test can show whether your level is low, borderline or in range.

Vitamin B12 and folate

Vitamin B12 and folate are involved in red blood cell production, nerve function and energy metabolism. Low levels can sometimes sit alongside tiredness, mouth ulcers, pins and needles, memory or concentration changes, but symptoms can overlap with many other causes.

Why context matters

A vitamin result does not always explain symptoms on its own. Your GP may interpret it alongside your diet, medication, gut health, previous results and other blood tests such as FBC, ferritin, thyroid, liver or kidney markers.

When to test

When vitamin testing is worth doing

Vitamin testing is most useful when symptoms, diet or previous results make deficiency a realistic possibility.

Tiredness, weakness or low energy

If you feel persistently tired, weak or run down, vitamin D, B12 or folate may be worth checking as part of a wider review. These tests can be useful, but they should not replace checking other common causes where symptoms suggest them.

Restricted diet, absorption or medication factors

Testing can be relevant if you follow a vegan or restricted diet, have digestive or absorption issues, take certain regular medicines, or have had previous low vitamin levels. Your GP can help decide which markers are worth checking.

Monitoring after treatment

If you have already been diagnosed with a deficiency or have started supplements, repeat testing can help show whether levels are improving and whether the dose or plan needs adjusting.

Results

Understanding vitamin blood test results

The useful question is not just whether a level is low, but why it is low and what should happen next.

Low or borderline results

A low vitamin result may lead to supplements, dietary advice or further checks depending on the marker and your symptoms. If B12 or folate is low, your GP may also consider whether anaemia, absorption or medication factors need reviewing.

High results and supplements

More is not always better. If you are taking supplements, bring the dose and brand details to your appointment. High levels can sometimes reflect supplementation and may change the advice on what to continue.

What may happen next

Your GP may suggest treatment, repeat testing, or related tests such as a full blood count, ferritin, thyroid function, liver function or diabetes markers if your symptoms need a broader explanation.

Clinical quality

The standards behind every test

The clinical standards behind every DocTap blood test, across our London clinics.

CQC rated ‘Good’.: Independently inspected and regulated by the Care Quality Commission.
Fully GMC-registered doctors.: UK-trained and experienced GPs only.
Every consultation reviewed.: Each one is checked for quality and safety, overseen by our Medical Director.
No sales incentives.: Our GPs are never paid commissions for tests or treatments.