Blood sample collection options

You can choose your preferred collection method when you checkout

Finger prick kit (FREE)

You can do this test at home without the need for a doctor. We'll send you everything you need to collect your sample and post it back to us. And it's all included in the cost. We've put together a video that covers the process, making it easy to check and track your health from home.

Home nurse appointment (+£45) was £60

We'll arrange for a medical professional to visit your home and collect your sample. This is great if you're unsure on how it all works or have trouble collecting a sample. No need to book a doctor's appointment or visit a clinic, we'll send you everything you need to collect a sample and post it back to our labs.

Visit a partner clinic (+£45)

Once you've ordered your test, look out for an email from our phlebotomy partners containing information and a link to book your appointment. We'll send you everything the clinic will need to complete the sample and post it back to our labs.

Organise a nurse myself (FREE)

If none of the above options work for you, you can arrange your own medical professional to collect your sample. There is no additional charge for this. Once you've ordered your test, we'll send you everything you and your chosen medical professional will need to collect a sample and post it back to our labs.

Still unsure how it works? You can find more information on collection methods and the service we provide in our 'How it Works' section.

What gets tested?

8 Biomarkers

Additional biomarkers can be added by personalising this test.

What are biomarkers?

Biomarkers are specific compounds we can detect in your blood sample that reflect different things about your health. Your test will tell you your levels for each of the above biomarkers, and whether they are in a normal range.

About flexible subscriptions

How does a subscription work?

When you purchase this test subscription plan, we will automatically send you another test kit in a few months. Don't worry - you have full control over when this will be, and you can change/cancel it anytime.

When you first purchase this test, you can choose your subscription options in the checkout. We do this, because we recommend taking multiple tests over time to track how your biomarkers change. You'll be charged per test kit (rather than monthly, for example).

Why subscribe to multiple tests?

One test will show you what areas you need to focus on, continued testing will help you learn how your training, diet and lifestyle is impacting your health.

How often should I test?

We recommend a follow up test 3 months after your first test, followed by a test every 6 months depending on your results, but its up to you!

Can I change what's tested in future tests?

Yes, you can tailor/customise subsequent tests (via your app) to focus on just the areas that need improving.

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Forth home blood test kit with purple and yellow tube
Ferritin and Active B12 results from Forth's at-home immune system blood test
Hand holding a lancet up to a finger on the other hand
White blood cell count blood test results from Forth's at-home immune health test
Focus where it counts - blood test results from our at-home immune system health blood test
Inflammatory marker results from Forth's at-home immune health blood test
Analysed by
NHS Lab
Tracked 24
delivery
Personalised
GP advice
Finger prick or venous collection

Immune System Blood Test

Trustpilot 4 stars

Results in 2 working days

8 Biomarkers

Worried about a weak immune system? If you often feel tired, get sick frequently, or struggle to recover from illnesses, your immune system may need support. Our immune system blood test checks key health markers, including white blood cell count, inflammation levels (hs-CRP), and essential nutrients like vitamin D and B12. These markers help identify potential deficiencies or imbalances affecting your immunity. With clear results and expert insights, you’ll understand how to strengthen your immune system and improve your overall well-being.

Analysed by
NHS Lab
Tracked 24
delivery
Finger prick or venous collection

£98

Klarna

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What gets tested?

8 Biomarkers

Blood sample collection options

1 Million+

results delivered

As seen in

As seen in
63% of women and 42% of men had ferritin levels outside the "healthy" range

The importance of immune health

A weak immune system can leave you vulnerable to frequent colds, infections, and slow recovery times. But how do you know if your immune system is functioning properly? Our immune system blood test can identify key imbalances, helping you take action before illness strikes.

We looked at thousands of blood test results in February 2025 and our data shows that many people have low Vitamin B12 and ferritin levels, both essential for a strong immune response.

Around 33% of women and 21% of men have suboptimal B12 levels, which can lead to fatigue, brain fog, and weakened immunity.

Ferritin data revealed almost two-thirds of women (63.7%) and 42% of men had levels outside the “healthy” range. Consistently low ferritin (iron) levels can lead to poor energy levels and frequent illness, making it an important area for improvement.

A simple immune system blood test allows you to check for these key markers, helping you identify deficiencies and track your immune health over time. By understanding what your body needs, you can take targeted steps through diet, supplements, or lifestyle changes to strengthen your immune system and stay healthier for longer.

How our Immune System Blood Test works

Getting the insights you need to improve your health has never been easier.

How it works - collect your sample

Collect your blood sample

Taking a small finger-prick blood sample at home is quick and easy. Use the included Tracked-24 envelope to send it securely to our lab for analysis.

How it works - view your results

Get fast, accurate results

You’ll receive a detailed report with your personalised health score and insights into your immune system health, including doctor-reviewed comments.

How it works - make improvements

Improve your immune health

Your results highlight areas needing attention, helping you make targeted lifestyle and nutritional changes to support a stronger immune system.

Build immune strength and long-term health with HealthCoach

Unlock your immune health scores with the immune system blood test. Get detailed insights, goals and tips on how to improve your immunity and long-term health.

Unlock your health scores

63/100 Immune health score

Translates biomarker results into health scores, giving you better insight into your immune health and wellbeing.

Personalised health targets

ALT

Healthy
Green target bar

8 (IU/L)

Next target 10 - 14 (IU/L)

Get incremental, achievable targets based on your unique results, ensuring progress at every step

Focus where it counts

25

100

Liver Proteins

NEEDS ATTENTION

50

100

ALP

SOMEWHAT LOW

HealthCoach's smart algorithms identify the specific areas which will make the biggest impact on your immune health

Guidance for optimal health

20

100

Liver Proteins

NEEDS ATTENTION
Dr Thom Phillips

There are a number of causes of low albumin including both medical and lifestyle factors. The most common cause is linked to nutrition, particularly a lack of protein in the diet. Other causes include liver and kidney function changes, smoking, reduced muscle mass and low physical activity and exercise.

Get tailored advice which considers your gender, age, hormone treatments and menstrual cycle to help you reach optimal health

Immune System Blood Test, recommended by our doctors

"Our immune health blood test offers valuable insights into your immune system function. By measuring key markers like white blood cell count, antibody levels, and inflammatory markers, it helps assess your overall immune health. This information can aid in early detection of infections, autoimmune disorders, or immune deficiencies."

Dr Thom Phillips

Dr Thom Phillips

Clinical lead

Frequently asked questions

This is what our customers ask us about the most. For more information, try our help centre.

Can I check my immune system at home?

Yes, you can check your immune system at home with our fingerprick blood test kit or you can have a trained nurse visit your home to collect the blood for you.

You can choose your collection method once you add the test to your basket.

How accurate is the immune health test?

Our immune system blood test is conducted in accredited UK labs that meet the highest clinical standards. Each biomarker is tested using state-of-the-art technology, ensuring high accuracy and reliability. Results are reviewed by medical professionals, giving you a clear and precise assessment of your immune health.

What does this test check?

This test measures key biomarkers that indicate how well your immune system is functioning. It includes:

  • White blood cell count – essential for fighting infections
  • Inflammatory markers (hs-CRP) – to check for underlying inflammation
  • Vitamin D, B12 & Ferritin (Iron Storage) – crucial for supporting immune function

What causes low immune health?

A weak immune system can be influenced by several lifestyle, dietary, and medical factors. Some of the most common causes include:

  • Nutrient deficiencies – Low levels of Vitamin D, B12, and iron (ferritin) can impair immune cell function, making it harder for your body to fight infections.
  • Chronic stress and lack of sleep – High stress hormones and poor sleep disrupt the immune response, increasing susceptibility to illness.
  • Unhealthy diet and lifestyle – Diets low in essential vitamins, minerals, and antioxidants weaken immune defences, while smoking and excessive alcohol can suppress immune function.
  • Underlying health conditions – Autoimmune disorders, diabetes, and chronic infections can impact immune strength.
  • Menstrual blood loss can lead to low ferritin (iron storage) levels, reducing red blood cell production and weakening immunity.
  • Pregnancy and postpartum changes can temporarily lower immune defences due to hormonal shifts.

Can I fix a weak immune system?

Yes! Many factors affecting immunity can be improved with lifestyle changes. Addressing nutrient deficiencies, improving sleep, reducing stress, and eating a balanced diet can strengthen your immune system. This test provides insights to help you make targeted changes and track progress over time.

How can this test help me?

A blood test to check your immune system helps you understand if you have key nutrient deficiencies, inflammation, or an underlying issue affecting your immunity. By identifying areas for improvement, you can take proactive steps to support your immune health, reduce illness frequency, and improve overall well-being.

You’ll get goals tailored to your specific needs to help you set a wellness journey that suits you.

When will I get my results?

You’ll receive your immune system blood test results within 2 working days after your sample reaches our lab. Your report includes detailed biomarker analysis, an optional doctor’s comment, and easy-to-understand insights into your immune health.

How soon will the test arrive?

Once you place your order, your test kit will be dispatched the same day (if ordered before 3 pm on weekdays) via Royal Mail Tracked-24, meaning you should receive it within 1-2 days.

What is a health score?

Your health score is a personalised rating based on your test results. Scores range from 0 (poor) to 100 (excellent). It helps you understand how well your immune system is functioning and highlights any areas that may need improvement. Tracking your health score over time allows you to monitor progress and make informed health decisions.

Health sores are included at no extra cost and can be viewed in our app.

How often should I check my immune health?

We recommend taking an immune system blood test every 6 months to monitor changes and track improvements in your immune health. Regular testing allows you to see if nutrient levels, inflammation markers, and immune function are improving based on any lifestyle or dietary changes you make.

If you have a weakened immune system, frequent infections, or underlying health conditions, more frequent testing (every 3-6 months) may be beneficial. This helps you stay on top of deficiencies, inflammation, and overall immune performance so you can take proactive steps to strengthen your defences.

Is your packaging discreet?

Yes, all of our test kits are sent in plain, unbranded packaging for complete privacy. There are no logos or markings that indicate the contents, ensuring a discreet and confidential delivery. Your test results are also stored securely in your online account, accessible only to you.

We are dedicated to supporting you on improving your health

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Immune System Blood Test