Vitamin b12 (active)

This is an important test that can be used to detect a B12 deficiency.

Finger-prick blood
1 tests included
2 days turnaround



About Vitamin b12 (active)

What is vitamin B12 (active)?

Vitamin B12 is an essential vitamin for making red blood cells (RBCs) and for the function of nerves. Vitamin B12 is found in meat, fish, dairy and eggs. A deficiency in B12 may lead to anaemia. Anaemia is a common blood condition characterised by low levels of red blood cells (RBCs) or haemoglobin.

Haemoglobin is an important component of RBCs responsible for transporting oxygen. It is important to have the right amount of haemoglobin and RBCs, as well as vitamins and iron required for RBC production, to supply the body with enough oxygen.

Symptoms of a vitamin B12 deficiency include fatigue, pins and needles, mood changes, breathlessness and pale skin. Active B12 is the form of B12 that is readily available for the body and appears to be a more sensitive marker for detecting B12 deficiency. Active B12 is not routinely measured on the NHS.

Why take the test?

This test measures the level of active B12 in the blood and can be used to detect a B12 deficiency.


What's tested


How it works



Purchase your Kit

Just order a test online and get your kit delivered right to your door unless you are ordering a COVID-19 Fit to Fly test where you will be given appointment options to attend our clinics across the United Kingdom for a nose and throat swab PCR test at the checkout stage.



Take your test and post

Follow our simple instructions to take your sample and post back the enclosed prepaid envelope to our accredited lab for processing. We also offer home or workplace visits by a qualified nurse. For COVID-19 Fit to Fly tests you must attend one of our partner clinics for our trained collection officers to take your sample. You will then have the results emailed to you.



Get results directly to your dashboard

You will receive an email notification from our medical team when your results are available on your secure personalised health dashboard.