Vitamin B12 Blood Test


This test is ideal if you’re feeling tired / weak / brain fog / pins and needles. You may also suffer the following conditions: thyroid, Crohn’s or coeliac disease, all which cause struggle to absorb Vitamin B12.

Today’s lifestyle can have an impact on our well being. Feeling, for example, tired, irritable or having palpitations may be due to having a vitamin B12 deficiency.



Vitamin B12 Blood Test

Vitamin B12 is a very important nutrient that is involved in producing red blood cells, maintaining a healthy nervous system, and converting food to energy. It also helps to control the immune system and mood.

Causes of Vitamin B12 deficiency

For the majority of people, the cause of their deficiency is dietary, especially if they are vegetarian or vegan. However, some people are unable to absorb Vitamin B12 from food and some take medications which can reduce the absorption of Vitamin B12 from the stomach, such as metformin (which is used for diabetes) or omeprazole (which is often prescribed for indigestion).

Symptoms of Vitamin B12 deficiency

As Vitamin B12 is essential for making red blood cells. Lack of this vitamin can cause anaemia which will give you the symptoms of tiredness, lack of energy, breathlessness, headaches and maybe even dizziness.

It is however possible to have low vitamin B12 without anaemia but may affect the nervous and immune systems which may cause symptoms such as pins and needles, altered vision, mouth ulcers or tongue soreness, forgetfulness and muscle weakness.

Foods rich in Vitamin B12

It is only naturally found in animal products including meat, eggs, fish, milk and dairy products.
Plants do not make B12 and so will not provide this vitamin. Foods richest in B12 include:

  • Liver and organ meats
  • Shellfish
  • Clams
  • Oysters

If you are not keen on seafood , B12 can also be found in:

  • Lamb
  • Beef
  • Eggs
  • Cheese

It is worth checking on cereal packets as some breakfast products are fortified with Vitamin B12.

Testing for Vitamin B12

The test can be performed using a small amount of blood from a finger prick which you can do yourself.

How often should I have a Vitamin B12 blood test?

We recommend checking your Vitamin B12 levels annually unless you experience any health changes or commence a weight loss programme which involves a restricted diet.

Other Questions

  • Family history of Type 2 diabetes
  • Overweight
  • Obese
  • Tiredness
  • Excessive thirst
  • Excessive need to urinate
  • Genital itching
  • Weight loss

This blood test is to check on:

  • Active Vitamin B12

For best results (if medically suitable) it is advisable to fast (water is allowed) 12 hours prior to the test which needs to be taken first thing in the morning and posted on the same day on a Monday, Tuesday,or Wednesday.

Collection method: Finger prick
Results available: 2-5 days after the sample has reached the laboratory.

Active Vitamin B12

Vitamin B12 is needed in the production of red blood cells, for brain health and to keep nerves healthy, and aids in the making of DNA.
Low levels may indicate anaemia.

How it Works

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1. Order and Receive Your Test

Order your Blood Test.
Receive it directly at home or work.
Delivered by courier with Free shipping.

2 Fingerprick Red 512w -
2. Take the Easy Finger-prick Blood Test

Activate your test online.
Collect 2-3 drops of blood.

3 Pre paid sample Red 512w -
3. Freepost your Blood sample to our laboratories

Use the pre-paid package to post to our laboratories.
Simply drop it into your nearest high-priority Royal Mail postbox.

4 Laboratory analysis Red 512w -
4. Our laboratory team run the tests

Tests are run by our staff in a clean and secure environment.
All possible measures are taken to keep Vampires out.

5 Secure online results Red 512w -
5. Receive Your Results within 7 days

We will email you to inform you that your blood test results are ready.
Login to your account to review the results.

6 Track your levels Red 512w -
6. Track your levels over time

With regular ongoing tests, you can track your results.
Check if you’re improving healthily or where changes could be made.

What’s In The Test?

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Home to laboratory kit
  • Blood Test
  • A prepaid return envelope (UK & Ireland only)
  • Two single-use lancets
  • One blood collection tube
  • One blood collection tube label
  • One plastic blood collection tube case
  • Two adhesive plasters
  • A cleansing wipe