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Thyroid Stimulating Hormone (TSH) Blood Test

Original price £35.00 - Original price £35.00
Original price
£35.00 - £35.00
Current price £35.00

A TSH blood test measures the level of TSH in the bloodstream and is commonly used to assess thyroid function.

  • Biomarkers: 1
  • Turnaround: 1-2 days

Simple and accurate blood test from a laboratory you can speak to.

Step 1. Choose sample collection option

Currently selected option: HOME KIT via Royal Mail Tracked 24

  • Available everywhere in mainland UK.
  • Includes everything you need to take a safe and suitable blood sample in about 15 minutes.
  • Post the sample back to our laboratory via Royal Mail Tracked 24.

Re-test guarantee

About the test

We offer convenient, accurate and reliable thyroid stimulating hormone (TSH) blood tests that you can take from the comfort of your own home. Our home test kits or clinic sample collections provide same-day or next-day results, allowing you to take control of your health quickly and easily. With our CQC-regulated laboratory and state-of-the-art diagnostics technology, you can trust the accuracy of your results.

If you have symptoms of a thyroid disorder, such as fatigue, weight gain, or hair loss, or if you have a family history of thyroid issues, our TSH blood test is perfect. And with our powerful online Health Dashboard, which you will gain free access to, you can easily track your TSH levels over time and take the necessary steps to improve your health.

Do not wait to take control of your health. Order your TSH blood test from One Day Tests today and get the answers you need to make informed decisions about your well-being.

What is a thyroid stimulating hormone blood test?

The pituitary gland produces Thyroid Stimulating Hormone (TSH) to instruct the thyroid gland to produce hormones T3 and T4, which regulate metabolic function, growth, and weight. Higher TSH concentrations indicate lower thyroid function, whereas lower TSH concentrations suggest an overactive thyroid gland.

The TSH blood test is used to evaluate thyroid gland function and to help diagnose thyroid disorders. If the thyroid gland is not producing enough T3 and T4, the pituitary gland produces more TSH to stimulate the thyroid gland, resulting in a higher TSH level in the blood. Conversely, if the thyroid gland is producing too much T3 and T4, the pituitary gland produces less TSH, resulting in a lower TSH level in the blood.

A TSH blood test will help determine what you are experiencing. It can also be used to monitor thyroid hormone replacement therapy in people with confirmed hypothyroidism.

1 Biomarker


    - Thyroid Stimulating Hormone (TSH)


    Need more biomarkers? Check out out our Thyroid Function Blood Test.


    For most biomarkers our usual turnaround time is 24-48 hours, or less, from the time your sample is in our lab. We do not wait for all the results to complete before sending them to you, so you may start receiving results the same day for most cases, or as results become available.

    We are extremely proud of our very short turnaround times and a very efficient laboratory processes. Whilst we accommodate the shortest of time scales, with some results available within hours, for this particular test the usual turnaround time is:

    1-2 days

Doctor's notes

Hi, I am Dr. Adam Staten and here's my view on this test as a GP and Clinical Director at One Day Tests.

In order for the thyroid to produce essential hormones the brain needs to tell it to do so. The responsibility for that lies with the pituitary gland, which produces Thyroid Stimulating Hormone (TSH). The TSH stimulates the thyroid to produce triiodothyronine (T3) and thyroxine (T4) hormones, which are then used to control various body networks, from metabolism to growth and weight.

The more TSH is produced the more T3/T4 is consequently produced, so the TSH is a good indicator of how well the thyroid is performing.

If there is too much T3 or T4 then the thyroid is working too hard (overactive) and producing too much T3/T4. So there is no need for extra TSH to stimulate the thyroid gland. So the TSH concentration will be lower.

If, on the other hand, the thyroid is not particularly active (underactive) and is not producing enough T3/T4 then the pituitary gland has to produce more TSH to stimulate the thyroid and hence the concentration of TSH will be higher.

Red flag symptoms for the Thyroid Stimulating Hormone (TSH) Blood Test

Even if your blood tests are normal, you should see a doctor if you have any of the symptoms below because they may be a sign of serious underlying illness:

  • Unexplained weight loss
  • Drenching sweats during the night
  • Persistent fevers
  • Progressively severe symptoms of any kind

Your Results and Health Dashboard

The results of your Thyroid Stimulating Hormone (TSH) Blood Test will be emailed to you as a secured PDF file, ready for your GP and will also be uploaded to our Health Dashboard area of the website. It’s a unique and powerful tool, powered by our in-house clinical analysis research, to match your biomarkers across test panels and symptoms, as well as provide clinical commentary on all individual biomarkers you tested for.

The health dashboard will also provide "panel level" commentary - a birds eye view of the biomarkers that were tested. This feature allows you to view your test results and clinical commentary, and compare them to previous results, giving you a clear understanding of how your health is progressing.

By using the Health Dashboard, you can identify changes in your biomarkers and make necessary adjustments to your lifestyle. This added value is immense, as it empowers you to monitor your health and make informed decisions about your well-being.

It's free and is available with all of our tests.

Save on continuous monitoring with our subscription plan

The best way to look after your health is to do so regularly. This is easy to do with our continual monitoring plans which give you a discount on future blood tests. You choose the frequency and we'll do the rest.

When you purchase a subscription, we will deliver your home test kits or allow you to book appointments in line with your chosen frequency. You will be able to track your biomarkers over time in our powerful Health Dashboard, where results will be automatically updated for you. There is a minimum of 3 tests with any subscription, after which you can pause/restart/cancel at any time.

Special instructions

Hi, I am Stefania Brown, I am the Laboratory Manager at One Day Tests and here are the lab's special requests for the Thyroid Stimulating Hormone (TSH) Blood Test.

This test should be taken after any symptoms of short-term illness have resolved. If you are taking biotin supplements, stop taking them 72 hours before the test.

Otherwise, there are no special instructions for this blood test.

Venepuncture appointment - how to prepare

If you are coming into one of our clinics for the test, this is what you need to do before you arrive:

  • Drink plenty of water about an hour before the appointment.
  • Avoid coffee/tea/energy drinks. Water is good!
  • That’s it! We’ll do the rest.

Home test kit for Thyroid Stimulating Hormone (TSH) Blood Test - how it works

Our blood test kits are simple and convenient.

The most important step in doing a blood test at home is to read the instructions very carefully. The process is very simple, but there are a few pitfalls you need to be aware of - you will save yourself a lot of time if you do it right the first time around!

  • Full printed instructions will arrive with your kit - please read them carefully.
  • Drink plenty before taking the sample and warm your hands up in the sink with warm water for a few minutes. This will make your blood flow much better.
  • Fill the tubes to the top line. We don’t need much blood; filling tubes to the top line is about 15 drops of blood.
  • Post the samples on the same day you take them, before midday, Monday to Thursday. If you post it any other time it might get to us late or be stuck at a sorting office over the weekend. You will then have to do it again.
  • Package the sample in the same box the kit came in. Otherwise, Royal Mail or DPD will reject it. The sample tubes go into a pouch, then into a cardboard box, and then into a return envelope. All of this is provided in the kit: please use it.

We look forward to receiving your sample in our lab!

How the finger prick home test kit for Thyroid Stimulating Hormone (TSH) Blood Test works - from Dr. Adam Staten

Why choose us?

Hello! My name is Dr. Vinesh Mistry, I am part of the GP team here at One Day Tests and here is why you should trust us to test your blood.

We run our own regulated laboratories and our own accredited clinics. We manufacture our own approved home sample collection kits. Your results are looked after by our fantastic clinical governance team and our super-talented biomedical science team.

When you book your test with us - you book directly with the lab. This means accuracy and responsible duty of care, direct access to the provider and extremely fast turnaround times.

Finally, our customer services rock! You can ask the lab a question any time or you can speak to a real human. It's good to WhatsApp, email on or give us a call on 0845 527 07 67.

Frequently Asked Questions

Hi, I am Lana Nela, Lead Nurse, and here is what we are frequently asked about this test.

Should I be checking for other thyroid hormones as well?

Looking at the levels of  T4, T3 and TSH  together gives us a lot of information about the underlying cause of any thyroid disorder and helps us to establish where exactly the problem lies. Checking these three together can also help us identify early diseases that may not yet be clinically apparent.

Should I test for antibodies as well?

Most thyroid problems are caused by autoimmune diseases – most commonly Grave`s disease and Hashimoto`s thyroiditis. The presence of autoantibodies helps us to establish that this is the case. Some people will have these antibodies but will not have a problem with thyroid function. These people may never develop thyroid disease, but they are at higher risk of doing so and may choose to have regular monitoring so that any problem is picked up early.

If you would like to test for antibodies then please have a look at our Ultimate Thyroid Function Blood Test.

Why take this test?

Hi, I am Dr. Marco Esposito and here is why it's important to take this test.
  • To determine if the thyroid gland is functioning properly
  • To diagnose an underactive or overactive thyroid gland
  • To monitor thyroid replacement therapy in individuals with a thyroid disorder
  • To identify the cause of unexplained weight changes, fatigue, hair loss, and other symptoms associated with thyroid disorders
  • To screen newborns for congenital hypothyroidism

Is this test right for you?

Hi, I am Sandeep Patel, I am the Laboratory Director at One Day Tests. Here are the symptoms that you may wish to address with this test.

A blood test for thyroid stimulating hormone may be recommended if you experience symptoms such as fatigue, weakness, weight gain or difficulty losing weight, constipation, cold intolerance, dry skin, hair loss, joint pain, heavy or irregular menstrual periods, depression, difficulty concentrating, muscle weakness, elevated cholesterol levels, slow heart rate, goitre, or have a family history of thyroid disease.

This test can help diagnose an underactive or overactive thyroid and guide treatment decisions.


    Chronic fatigue, Dry skin, Fatigue, Make your own test panel, Thyroid, Tiredness, Weakness, Weight gain, and Weight loss

Why blood tests are important.