Complete thyroid function test

Our most in-depth thyroid test. Check your thyroid hormones, thyroid antibodies, and related vitamins and minerals.

Track your progress with a subscription:

  • See your results change over time with trend charts
  • Make lifestyle changes and see how they improve your health
  • Change what you're testing, pause or cancel anytime


  • Free delivery
  • Test arrives in 2-4 working days

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How can a thyroid blood test help you?

This test checks your thyroid function and helps you understand if your symptoms might be due to a thyroid disorder, like an overactive or underactive thyroid. It also checks to see if you’re getting enough of the nutrients needed for a healthy thyroid or whether your symptoms may be due to key vitamins and minerals deficiencies.

An underactive thyroid (hypothyroidism) and overactive thyroid (hyperthyroidism) could explain :

  • weight loss or weight gain
  • shaking and tremors
  • increased irritability, anxiety, or depression
  • fatigue and lack of energy
  • muscle aches, cramps, or weakness
  • low sex drive (libido)
  • irregular or heavy periods

Once diagnosed, your thyroid function needs to be monitored to ensure your thyroid hormone levels are optimal. With a GP report and advice on how to maintain or improve your results, we help you understand how to support your thyroid function.

We recommend doing a thyroid blood test every 3 months if you have an underactive or overactive thyroid.

What's covered in this blood test?

Advanced thyroid profile

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Your thyroid gland produces hormones that help control your metabolism. If it isn't working properly it can cause mood problems and weight gain or loss. A blood test can check for thyroid disorders.

Vitamin D

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Vitamin D plays a key role in your long-term health, particularly your bone health. It's also important for a strong immune system and is linked to your sleep, energy levels, and mood.


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Ferritin can help you understand more about your iron levels — a nutrient that helps transport oxygen around your body. If your levels are low, it can affect your energy, sleep, and fitness.

Active vitamin B12

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Active vitamin B12 is the amount of vitamin B12 your body can actually use. Low vitamin B12 levels can make you feel depressed and might affect your sleep and fitness.

Collection method

Your test kit contains everything you need to collect your sample at home. Our instructions will guide you through it.

How it works

Thriva kit

Do your test

Your kit arrives in 1-2 days. Find out how to collect your sample at home. You’ll need to fill 2 tubes for this test — around 10 drops of blood.

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Get fast, accurate results

Free post your sample to our lab and get your results in as little as 48 hours. Access your GP-reviewed report in your results dashboard.

Blood test results trend on laptop

Support your thyroid health

Our doctors give you evidence-based tips to help you improve or maintain your thyroid health. And you can access articles, podcasts, and recipes.

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Data protection

Your data is in safe hands. We use the latest encryption technologies and take our Data Protection obligations seriously.


What's included in your home testing kit?

our Thriva test kit includes:

- collection tube(s)

- plaster x 2

- return form x 1

- alcohol swab x 1

- lancet x 3

- prepaid envelope x 1

- cleansing wipe x 1

- collection tube label(s)

- protective plastic case x 1


How to collect your sample at home

Learn how to collect your finger-prick blood sample at home by following our instructions. You can access these on the app too. It takes around 30 minutes to complete the process at home.


Will a GP write your report?

Our doctors review your blood test results and upload a detailed report to your account dashboard. They also give you advice to help support your health or manage an existing condition.


Things to note before collecting your sample

A biotin supplement can lead to falsely high T3 and T4 results, as well as low TSH levels. If you're taking biotin, avoid taking it for at least 2 days before collecting your blood sample — to reduce the risk of it affecting your results.

You can also add that you're taking biotin to your health profile — so our GPs are aware when reviewing your results.


How long does it take to get your results?

Our doctors aim to upload your results report to your account dashboard within 48 hours from the lab receiving your sample. Tests containing Omega-3 & 6 have a 10-day turnaround time after posting your sample.


How do you know when your results are ready?

We’ll email or text you to let you know your blood samples have been received, processed, and are ready to view on your results dashboard.

What else do you get?

Get a personalised plan to improve, maintain, or develop healthy habits for life. Access on your dashboard.