Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
The_Daily_Mirror_logo - welzo
Healthline_logo.svg_1 - welzo
metro_1 - welzo

Thyroid Blood Test

Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
Thyroid Blood Test - welzo
The_Daily_Mirror_logo - welzo
Healthline_logo.svg_1 - welzo
metro_1 - welzo

Sale price £29.99
Save 23% Regular price £39.00
36 Reviews

The Thyroid Blood Test monitors your thyroid functioning allowing you to optimise your hormonal levels. These hormones are responsible for regulating many important bodily functions, including metabolism.


Suitable for adults 18 years of age and above. 

Free next-day delivery
Results within 2 days
What does it test for?
  • Thyroid Stimulating Hormone (TSH)
  • Free Triiodothyronine (FT3)
  • Free Thyroxine (FT4)
Email when stocked
The_Daily_Mirror_logo - welzo
Healthline_logo.svg_1 - welzo
metro_1 - welzo

The UK's Highest Rated Home Testing Provider

Online Influencer
Joanna Charice reviewed
"After using the Welzo Tiredness & Fatigue Blood Test due to ongoing tiredness, I found the testing process simple and the results came quickly. They revealed low iron levels. With this knowledge, I adjusted my diet and started iron supplements, which markedly improved my energy. This test was a key part in addressing my fatigue."
Assistant Athletic Trainer
Jordan Waits reviewed
"I simply ordered the test online, received it in the mail a few days later, and took the test in the comfort of my own home using a quick finger prick. The instructions were clear and easy to follow, and the process itself was quick and painless."
Health & Life Coach
Roxy Richards reviewed
"I followed the recommendations provided by Welzo, and I have to say, I feel so much healthier now. I have a lot more energy, and I just feel better overall. It's amazing how much of a difference small changes can make"
Online Influencer
Mimi Reviews reviewed
"The Welzo Female Hormone Test was a quick and effective way to shed light on my irregular periods. The results were clear and led to actionable insights, improving my discussions with my healthcare provider. Overall, a very positive experience."
  • Biomarkers
  • Information

Thyroid Stimulating Hormone (TSH)

TSH (Thyroid Stimulating Hormone) or thyrotropin is secreted by the pituitary gland, located in the head, and can help identify cases of hypothyroidism and hyperthyroidism. Both the excess and under-secretion of TSH can lead to weight loss, anxiety, palpitations, irregular sleep patterns and irregular menstrual cycles. Hypothyroidism is majorly associated with overlapping symptoms such as menopause.

Free Thyroxine (FT4)

FT4 or free thyroxine is one of the two critical hormones produced by the thyroid gland. While it is produced in greater abundance as compared to FT3, it is thought of as a reservoir for FT3 whenever the body needs and this leads to conversion of FT4 into FT3. Most of the thyroxine is not attached to a protein and the Menopause blood test helps to identify if there's a deficiency/excess of the hormone to detect thyroid related ailments.

Free Triiodothyronine (FT3)

FT3 or free tri-iodothyronine is one of the two critical hormones produced by the thyroid gland. Its deficiency/excess is responsible for most of thyroid-related health issues because of its stronger impact even though it constitutes the lesser fraction as compared to the other hormone, FT4. Menopause blood test detects the amount of FT3 which is not attached to a protein and helps to understand thyroid functioning.


The Thyroid Blood Test is suitable for individuals experiencing one or more of the following symptoms of hypothyroidism:

1. Rapid weight gain

2. Fatigue

3. Muscle weakness and stiffness in joints

4. Depression

5. Disturbed periods

Additional Insight from Dr Sameer Nakedar, MBBS, MRCGP, PGCert

Overactive thyroid conditions usually show a high level of T4 and/or T3 and, in most cases, a low TSH. Symptoms can include weakness, diarrhoea, weight loss, irritability, warm skin, fast heart rate, tremor and eye problems, along with other symptoms.

In underactive thyroid states (hypothyroidism), the TSH is usually high. This TSH rise tries to stimulate the thyroid gland to produce thyroxine. Usually, the T4 and/or T3 levels are low but can be normal.

Symptoms of hypothyroidism can include weight gain, fatigue, skin thinning and dryness, hair thinning, constipation, depression and low mood, muscle cramps, pain and numbness, low heart rate, irregular periods and cold sensitivity, along with other symptoms.


The Thyroid Blood Test is suitable for individuals experiencing one or more of the following symptoms of hyperthyroidism:

1. Hyperactivity and anxiety

2. Insomnia/disturbed sleep cycle

3. Muscle weakness and stiffness in joints

4. Irregular heart rate

5. Weight loss

Additional Information

Are you feeling tired all the time, despite getting a good night's sleep? Do you find it difficult to lose weight, no matter how hard you try? You might be suffering from an underactive thyroid. The Advanced Thyroid Function Blood Test is designed to help you get to the bottom of your thyroid problems. With this test, you can take a detailed look at your thyroid function and see how well your hormones are balanced. Armed with this information, you can work with your doctor to get your thyroid back on track.

A thyroid blood test is a simple blood test that measures the level of thyroid hormones in your body. With this test, you can optimise your thyroid hormone levels and ensure that they're within the healthy range. Thyroid blood tests are used to diagnose thyroid disorders, such as hypothyroidism and hyperthyroidism. They can also be used to monitor the effectiveness of treatment for these conditions. If you have symptoms of a thyroid disorder, your doctor may order a thyroid blood test to help make a diagnosis. Symptoms of hypothyroidism include fatigue, weight gain, and constipation. Symptoms of hyperthyroidism include weight loss, anxiety, and tremors.

During the test, a small sample of blood will be taken from a vein in your arm. The sample will be sent to a lab for analysis. The results of the thyroid blood test will help your doctor determine whether you have a thyroid disorder and, if so, what type of disorder you have. They can also help your doctor decide on the best treatment for you. If you are diagnosed with a thyroid disorder, it is important to follow your doctor's instructions for treatment. Untreated thyroid disorders can cause serious health problems. Treatment may include taking medication or having surgery. Always talk to your healthcare provider about your specific health needs.

A healthy thyroid keeps a person hale and hearty

Thyroid gland is one of the most essential elements of the endocrine system as it plays a critical role in regulating heart rate, metabolism, brain functioning and bone growth. To stay one step ahead, it is always advisable to opt for a regular thyroid checkup because a healthy thyroid is the key to staying fit.

of the elderly suffer from subclinical hypothyroidism
Subclinical hypothyroidism is a precursor to hypothyroidism and is more common in females compared to males. While the rates are lower in younger population, the chance of developing it increases with age.
of people in the UK develop symptoms of goitre
Goitre is caused by deficiency of iodine. This causes the thyroid gland to swell up to allow for more absorption of iodine from the blood. Enlarged thyroid glands causes symptoms of hyperthyroidism.

Experts Opinion on Thyroid Blood Tests

"Thyroid function tests look at three hormone levels. In normal states, the pituitary gland in the brain releases thyroid stimulating hormone (TSH), stimulating the thyroid gland to produce T3 and T4.

This thyroid function test can help you understand if your thyroid function is normal, overactive, or underactive."

Dr Sameer Nakedar
Experts Opinion on Thyroid Blood Tests

How to take a Thyroid Blood Test Test

Collecting a blood sample for your finger prick home test is straightforward. Watch the video below for more details on how to take a home blood test.

  • how1 - welzo

    Pick your home test

    We have a wide range of tests to cover your health needs. Order with next day United Kingdom delivery and avoid sitting in a doctor's office or clinic. Use our quiz to find the right test for you.

  • how2 - welzo

    Take your test

    Activate your test and collect your sample in the morning. Return your sample on the same day, using the prepaid shipping label provided. Samples use a simple finger prick collection method that takes around 5 minutes to complete.

  • how3 - welzo

    Results within 48 hours

    You'll get verified results and insights into what the biomarkers mean. Order now to become a healthier you!

Thyroid Blood Test Information

Specification of Thyroid Blood Test

  • Test name: Thyroid Blood Test
  • Also known as & related tests: thyroid function test, thyroid panel, TSH blood test, thyroid hormone blood test, free T4 blood test, and total T4 blood test
  • Biomarkers: Thyroid Stimulating Hormone (TSH), Free Thyroxine (FT4), Free Triiodothyronine (FT3)
  • Test tube: SST (Gold microtainer)
  • Brand: Welzo
  • Turn around time: Approx. 24 hours
  • Lab test ranges:
  • Test Kit Marking: MHRA/UKCA
  • Location of Lab: United Kingdom

What is a Thyroid Blood Test?

A Thyroid Blood Test is a home health test offered by Welzo. The Thyroid Blood Test can be taken from the comfort of your home using a finger prick sample, which is then sent back to our lab for analysis and interpretation.

What does a Thyroid Blood Test for? 

A Thyroid Blood Test tests for the following: Thyroid Stimulating Hormone (TSH), Free Thyroxine (FT4), Free Triiodothyronine (FT3).

What are the benefits of a Thyroid Blood Test?

Checking your health through the use of Thyroid Blood Test is an important way to track your health. Home testing offers the convenience of conducting health assessments in the comfort of your own home, while enabling quicker, more private results without the need for visiting a healthcare facility.

Can a GP review my Thyroid Blood Test?

Yes, Welzo offers a GP review service for the Thyroid Blood Test. Follow the link if you would like to have an online GP appointment with your Thyroid Blood Test.

Are Thyroid Blood Tests available on the NHS?

The NHS offers Thyroid Blood Tests subject to eligibility requirements, consultations and local guidelines.

Thyroid Blood Test Kit and Ordering

How can a Thyroid Blood Test be ordered?

A Thyroid Blood Test can be ordered online through Welzo's secure checkout. Select the Thyroid Blood Test and add the patient's name and details, then checkout for next-day delivery.

What is included in the Thyroid Blood Test test kit?

The Thyroid Blood Test contains the following items in the test kit:

  • 1 x UN3373 Test Kit for Biological Substances Category B (test kit design may vary from images displayed online depending on the test selected.
  • 1 x Free Return Label 
  • 1 x Finger Prick Lancet / Urine Sample Pouch or Swab (depending on the test ordered)
  • 1 x Cleansing Wipe/ Alcohol Swab
  • SST (Gold microtainer)

Thyroid Blood Test Biomarkers and Results

What biomarkers are tested for in a Thyroid Blood Test?

The Thyroid Blood Test checks for the following biomarkers: Thyroid Stimulating Hormone (TSH), Free Thyroxine (FT4), Free Triiodothyronine (FT3)

What are the results ranges for a Thyroid Blood Test?

Thyroid Blood Test reference ranges vary based on age, sex, population sample and numeric test result ranges. However, once you complete your tests, you will receive clear reference ranges for your Thyroid Blood Test.

What is a normal test range for Thyroid Blood Test?

The Thyroid Blood Test range will be provided on the advanced Welzo reporting panel which will factor in multiple aspects such as age, population size comparison and biological sex.

Thyroid Blood Test Procedure and Timing

When should a Thyroid Blood Test be taken?

It is best to take a Thyroid Blood Test first thing in the morning.

How long does a Thyroid Blood Test take?

The typical turnaround for a Thyroid Blood Test is 24 hours from receipt at the Welzo laboratory, Monday to Thursday. However, results may come back faster or slower depending on how busy the Welzo laboratory is and if you have requested any biomarkers that take longer to test for. In this case, results can take up to 5 days.

Are there any special preparations required before taking the Thyroid Blood Test (e.g., fasting)?

We will let you know via email if there are any special requirements for the Thyroid Blood Test. However, typically we recommend you take a Thyroid Blood Test first thing in the morning, fasted.

What is the best time to post my Thyroid Blood Test?

The best time to return your Thyroid Blood Test sample is Monday to Thursday, before 14:00 to ensure the product arrives at our lab on time for same-day analysis.

What sample is required for a Thyroid Blood Test?

The Thyroid Blood Test requires a capillary blood sample using a SST (Gold microtainer) that is collected from a finger-prick blood sample.

Convenient and fast
Convenient and fast

Welzo health tests are shipped straight to your address the very next day.

Secure and accurate
Secure and accurate

We are a team of UK based doctors and scientists, making cutting edge analysis accessible.

24/7 Customer Support
24/7 Customer Support

We issue results 24/7, giving you personal insights into your body with support from our UK based admin and lab team.

Welzo's Award Winning UK Home Blood Tests

Customer Reviews

Based on 10 reviews
Rency Emmanuel Pullattu

Thyroid Blood Test

Madeleine Dawson
Thyroid blood test

Excellent service provided
Very clear instructions within kit and quick and easy to carry out at home
5 star support throughout
Would highly recommend

Jade Boyland

Thyroid Blood Test

Stephen Ennis

Spot on

Hadlee Ball

This home thyroid blood test is a game-changer. It's incredibly simple to use, with clear instructions. The process is painless and quick, and results are accurate, delivered fast. it saved me a trip to the doctor's office. Highly recommend it for convenient and stress-free health monitoring.