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Vitamin B12 (Active) and Folate Blood Test

Vitamin B12 (Active) and Folate Blood Test


Vitamin B12 is essential for healthy nerves, blood cells and DNA. This test measures the levels of active Vitamin B12 and folate in your blood.
Blood sample 2 biomarkers included Results estimated in 4 working days from sample receipt at lab
Vitamin B12 (Active) and Folate Blood Test
Vitamin B12 (Active) and Folate Blood Test
Vitamin B12 (Active) and Folate Blood Test
Vitamin B12 (Active) and Folate Blood Test

What's included?

Biomarker profile

  • Vitamins

Vitamins (2 Biomarkers)

Special instructions

Prepare for your Vitamin B12 (Active) and Folate Blood Test by following these instructions. You should take this test before you take any medication or vitamin/mineral supplements. Do not take biotin supplements for two days before this test, discuss this with your doctor if it is prescribed. Do not take vitamin B12 for two weeks prior to this test. If your B12 is prescribed ask your doctor whether to stop.

From the expert

This blood test measures vitamin B12 and folate which are both essential water-soluble vitamins.

Vitamin B12 is a water-soluble vitamin that is found in virtually all meat products and certain algae such as seaweed that helps maintain healthy nerve cells, red blood cells and is also needed to make DNA, the genetic material in all cells. Good sources of vitamin B12 include meat, salmon, cod, milk, cheese, eggs, yeast extract and some fortified breakfast cereals. As this vitamin is found almost exclusively in animal-based products, those who cut out animal products from their diet are at risk of B12 deficiency so checking their B12 levels is very important.

Vitamin B12 deficiency symptoms usually develop gradually but can worsen if the condition goes untreated, they include headaches, feeling faint, pale skin and palpitations. Pernicious anaemia is an autoimmune condition which causes the immune system to attack cells in the stomach, preventing the absorbtion of vitamin B12.

Folate is a water-soluble vitamin important for the normal production of red blood cells and in the prevention of neural tube defects such as spina bifida in unborn babies. Folate is found in small amounts in many foods. Good sources include broccoli, Brussels sprouts, asparagus, peas, chickpeas and brown rice. Other useful sources include fortified breakfast cereals, some bread and some fruit such as oranges and bananas.

Dr Sam Rodgers MBBS, MRCGP
Chief Medical Officer

Why take this test?

  • You believe you might not be getting enough B12 or folate from your diet
  • You are vegan or vegetarian
  • You have symptoms which are consistent with deficiencies in these vitamins
  • You are planning a pregnancy or are pregnant

Laboratories you can trust

Trusted by the NHS and private clinics alike, you can be sure of the highest testing standards from our UKAS accredited partner laboratories.

Dr Sam Rodgers - Chief Medical Officer

Expert advice with your results

Get trusted advice and comments from one of our doctors based on your results.

Your personal health centre

Your personal health centre

Discover the easy way to track your health through our online portal, View your results with doctor's advice, monitor any changes over time and see the improvements you can make to your health with simple lifestyle changes.

Questions? Let us help
Questions? Let us help

Questions? Let us help

Our customer care team is on-hand to help you find the test that's right for you. Get in touch via phone, live chat or email.


Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.