Vitamin B12 (Active) Test Test

By Forth

Check your active vitamin B12 levels with our quick, easy-to-use home blood test kit. You take a simple finger prick test and we'll analyse your sample at one of our UKAS accredited labs in the UK.

This B12 blood test kit measures the active form of B12 specifically (as opposed to total B12). This is the most accurate way to measure your available level of vitamin B12 and is the best early indicator of any possible deficiency.  

Vitamin B12 (along with folate) plays an essential role in the formation of red blood cells and also has an important role to play in nerve health. The human body does not produce its own vitamin B12 , so it has to be absorbed through diet.

Low levels of this essential vitamin can leave you feeling tired and weak while prolonged deficiency can also lead to anaemia.

Our test enables you to check your own active B12 levels quickly, easily and affordably. Simply send your sample direct to our UKAS accredited lab and your accurate result will be available within 48hrs on our secure digital dashboard. 

Key benefits when using Forth’s tracking service

Fast & accurate

Fast & accurate analysis from accredited laboratory


Tests can be done at home


Secure access to online results

Online dashboard

Online dashboard which tracks results over time

Included in this test

Vitamins & minerals Markers
  • Active B12

How it works

Collect sample

We will send you a finger prick kit to use at home

Post sample

Pop your sample in the post to us using a pre-paid envelope

Online results

View your results on your secure personal health dashboard

Buy now

This test has the option to switch to a home phlebotomy. This means a healthcare professional will visit you at home to draw the blood sample from a vein.

Who is the kit for?

Date of birth (You must be 18+ to order a test):

Where would you like it delivered?

Delivery is only available within the UK.