Vitamin B12 (Active) Blood Test
£38 ✓ In Stock
Your sample goes to a UKAS accredited laboratory meeting ISO 15189 standards.
After you receive your order confirmation email, please reply with your date of birth.
How it works
Your testing journey
From order to results in four simple steps. Full transparency on where each step happens and what it costs.
Receive your kit by post
Dispatched same working day if ordered before 3pm. Royal Mail Tracked delivery, typically 1–3 working days. 90% of kits arrive within 24 hours.
Collect at home
Everything you need is in the kit. Collect your sample in the privacy of your own home — no appointment needed, no clinic visit.
Included in kit price
Small finger-prick sample
Use the single-use lancet included in your kit to take a few drops of blood from your fingertip — similar to how diabetics check their blood sugar. Takes about 2 minutes.
Return by prepaid envelope
Seal your sample in the biohazard bag provided and drop it in any Royal Mail postbox using the prepaid Tracked 24 envelope. Post Monday–Thursday for best results.
Home Finger-Prick Blood Collection Kit
- 1Blood collection tube
- 2Single-use lancet device
- 3Sterile gauze pad
- 4Adhesive plaster
- 5Cleansing wipe
- 6Biohazard specimen bag
- 7Prepaid return envelope (Royal Mail Tracked 24)
- 8Step-by-step instructions
Active vitamin B12, also known as holotranscobalamin, is the biologically available form of vitamin B12 that your cells can actually use. Unlike total B12 tests (which measure both active and inactive forms), active B12 provides a more accurate picture of your true vitamin B12 status. Vitamin B12 is essential for producing red blood cells which carry oxygen around the body, and it plays a vital role in metabolism and the nervous system. Prolonged deficiency can cause nerve damage, pernicious anaemia, extreme tiredness, muscle weakness, poor memory, numbness or tingling in the hands and feet, and mood changes. Vitamin B12 is found almost entirely in animal-based foods such as meat, fish, eggs, and dairy, though many vegetarian and vegan products are now fortified with B12. Deficiency is more common in vegetarians, vegans, older adults, and those with conditions affecting absorption such as Crohn's disease, coeliac disease, or atrophic gastritis. Low levels should be discussed with your GP, who may recommend further testing or supplementation.
This test is for screening and information only — it is not a medical diagnosis or professional advice. Please have your results reviewed by a qualified doctor or healthcare provider who can explain what they mean for your personal health situation. If your results show anything outside the normal range, or if you're worried about your health, see your doctor as soon as you can. Don't change any medications or treatments based on these results alone — always talk to your healthcare provider first.
NO CLINICS, NO QUEUES, NO HASSLE
Four steps to clarity
01
Pick your panel
Browse over 200 clinically designed test kits and choose the one that fits your goals.
02
Kit to your door
Everything you need arrives in discreet packaging with step-by-step instructions inside.
03
Collect your sample
Follow the simple instructions in your kit — whether it's a finger-prick at home or a venous draw at a partner clinic.
04
Insights delivered
Clear, easy-to-understand results sent to you online with actionable health guidance.
Frequently asked questions
This test measures Vitamin B12 (Active). Check the full biomarker list on this page for details.
Check Special Instructions on this page. General rule: fast 8-12 hours if cholesterol/glucose/insulin included. Most hormone, vitamin, and antibody tests do not require fasting. Morning collection (7-10am) preferred.
Follow kit instructions. Finger-prick: warm hands, use lancet as directed, fill tube to marked line. Venous: attend phlebotomy with lab form. Post same day, avoid Fridays/bank holidays.
Within the timeframe shown on this page. Notification sent when ready to view online.
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