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Vitamin B12 (Active) Blood Test

Name: Vitamin B12 (Active) Blood Test
Brand: Clinilabs
SKU: B12A
Price: 60.0 GBP
Availability: InStock

★★★★★ (4.9/5)

£60.00

1 Biomarker

Active Vitamin B12 measures the biologically available form of B12 that your body can actually use. It's key for energy, nerve health, and mental clarity.

How do you want to take your sample?

Book a venous draw at a clinic Venous

Visit our Fitzrovia clinic for a professional venous blood draw with same-day appointments available.

+£30.00

Appointment Required
Schedule at one of our partner clinics

Professional Blood Draw
Performed by certified phlebotomists

UKAS Accredited

What is this test for?

Assessing active B12 helps detect early or functional deficiency that may not be apparent on total B12 testing alone. Results guide supplementation decisions and further investigation where neurological or haematological symptoms are present.

What does this test measure?

This test measures holotranscobalamin, often referred to as “active B12.” Unlike total B12, which reflects all circulating forms, active B12 represents the fraction that is biologically available for use by cells. It plays a crucial role in nerve function, DNA synthesis, and red blood cell production.

When is this test recommended?

Active B12 testing may be recommended when symptoms such as persistent fatigue, tingling in the hands or feet, memory changes, or unexplained anaemia are present. It can also be requested in individuals with dietary restriction, gastrointestinal disorders affecting absorption, or those taking medications that may interfere with B12 uptake.

What’s included in this test

Vitamins

Vitamin B12 (Active)

Active Vitamin B12 measures the biologically available form of B12 that your body can actually use. It's key for energy, nerve health, and mental clarity.

Why Clinilabs?

Quick and accurate results

We run our own UKAS and CQC accredited laboratory and participate in 30+ external quality assurance schemes. This means we get you results you can rely on, fast.

High-quality, convenient service

With Clinilabs, you can typically book an appointment and have your results within the same day. No more waiting for weeks or months.

Early detection of health issues

Our seamless, accurate health checks allow you to Identify potential health concerns and act on them before they become serious problems.

Access to doctors

Elevate your health understanding with our comprehensive smart reports. Track, monitor and improve your health over time.

Private Tests, Fast Results

At Clinilabs, we believe healthcare should be simple, accessible, and confidential. Our private blood tests give you direct access to trusted medical insights without the need for a GP referral. With fast turnaround times, clear results, and expert support, you can take control of your health and make informed decisions with confidence.

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Vitamin B12 (Active) Blood Test