Get insights into your immune function with a blood test

Stay on top of your health with a home blood test and GP-reviewed results.


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What is immune function?

Your immune system is your first line of defence against harmful things (like viruses and bacteria), protecting you from infections and diseases. A range of things can affect how well it functions — including many lifestyle factors like diet and exercise.

What can this test tell you?

This blood test checks your liver function and measures a range of nutrients that are important for a healthy immune system. You’ll also get insights into other areas of your health and what to focus on so you can take health into your own hands.

What's included in this test?


Liver function

Your liver plays a role in over 500 functions in your body — like getting rid of harmful toxins and fighting infections. So if your liver function is under strain, it can affect your immune function. Your diet, alcohol intake, exercise habits, and weight have a big impact on how well your liver can function.


Active vitamin B12 and vitamin B9

 Vitamin B12 and vitamin B9 (folate) help to support your immune system. So if you’re deficient in these nutrients it can affect how well your immune system functions.

Sometimes, your immune system might be responsible for a nutrient deficiency. For example, if you have pernicious anaemia, your immune system attacks cells in your stomach that produce intrinsic factor — which your body relies on to absorb vitamin B12.


Vitamin D

Vitamin D is essential for a healthy immune system. In fact, a sign of vitamin D deficiency is getting sick often. Some evidence suggests vitamin D supplements might help reduce your risk of developing a cold or flu. In addition to this, vitamin D has also been linked to the prevention and protection against autoimmune diseases. 

Note: If you have sarcoidosis (an inflammatory disease) or a condition that affects your parathyroid glands (these regulate calcium in your body), it can make it difficult to interpret your vitamin D results. So in this case, it's best to work with your doctor and get specialist input.

How it works

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Get your Thriva kit

Order your test online. We'll post your finger-prick blood testing kit the next working day.

Do your test

Do your test

Your kit contains everything you need to do your test and post your sample. See how to do your test

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Get results in 48 hours

Your results, along with a personalised report from a GP, will be available online. Meet our doctors

Finger-prick blood testing kits are CE-marked and blood samples analysed by UKAS accredited lab

Your sample will be analysed by a CQC-registered and UKAS accredited lab. This finger-prick test and kit are CE-marked.

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Get insights that matter

Get insights that matter

Understand what’s happening inside your body and the impact your lifestyle is having.

Improve your health

Improve your health

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Want to know more?


How quickly will I receive my order?

We typically send out kits with Royal Mail 1st class on the same working day if ordered Monday through Friday before 1pm. Orders placed before 1 pm usually arrive the next working day, while orders placed after 1 pm typically take two working days.


Do I need to be in to receive my kit?

No — your test kit is designed to fit through your letterbox, and it don't require a signature on delivery.


Are the kits discreet?

Yes, your kit will arrive in plain packaging.

Order your test today


Data Protection

Your data is in safe hands. We use the latest encryption technologies and comply with the UK Data Protection Act 2018. See privacy policy

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Our blood testing kits are CE-marked, and we work with UKAS accredited labs who are registered with the CQC. See labs and accuracy