your discount will be applied at checkout
your 10% discount will be applied at checkout
  • Doctor reviewed results
  • Results in 48hrs
What's included
  • Finger prick / Phlebotomy kit
  • Accredited lab analysis
  • Market leading results dashboard
  • Postage & packaging
  • Results within 2 working days of receipt
  • Reviewed by a doctor or nurse
your discount will be applied at checkout

Advanced Thyroid Check

In Stock
Free Delivery
Results within 2 working days
This advanced thyroid blood test checks key thyroid hormones TSH, FT4 and FT3 together with thyroid antibodies to establish if your thyroid is functioning correctly.
What's included
  • Finger prick / Phlebotomy kit
  • Accredited lab analysis
  • Market leading results dashboard
  • Postage & packaging
  • Results within 2 working days of receipt
  • Reviewed by a doctor or nurse
your discount will be applied at checkout

Why Test Your Thyroid Function?

A thyroid imbalance, such as an overactive or underactive thyroid, can lead to problems with your weight, energy and mood.

Symptoms of an overactive thyroid include weight loss, fatigue, irritability and difficulty sleeping. Whereas, symptoms of an underactive thyroid include weight gain, hair loss, forgetfulness and low mood.

Testing thyroid hormones and antibodies help identify any potential issues with the thyroid gland such as a thyroid imbalance or an autoimmune condition. 

Despite a thyroid condition needing medical intervention, there are lifestyle changes you can make to help manage the symptoms and support your wellbeing.

When to take This tesT

You can provide the sample for the thyroid check at any time but we don’t recommend checking your thyroid levels at times of illness as this may not give you an accurate result.

What Are the Symptoms of
An Overactive Thyroid?

Thyroid conditions
x6 more likely
women are six times more likely to have a overactive thyroid problem than men.
Thyroid conditions
1/20 people
have thyroid disorders in the UK.

The difference between an underactive and an overactive thyroid are the levels of hormones the gland produces. For that reason, the symptoms can differ according to how fast or slow your body’s cells are working.

If you have hyperthyroidism (an overactive thyroid), then your thyroid is producing too much thyroid hormone and causing your body’s cells to work at a faster rate.

The symptoms of an overactive thyroid, include:

  • Feeling nervous, anxious, or irritable
  • Mood changes
  • Difficulty sleeping
  • Fatigue
  • Muscle weakness
  • Itchiness
  • Hyperactivity
  • Sensitivity to heat

The condition can also cause physical symptoms which you or close friends and family may find more noticeable such as:

  • Goitre – a large swelling in your neck
  • Fast or irregular heartbeat
  • Thinning hair or hair loss
  • Loose nails
  • Twitching or trembling
  • Eye problems
  • Warm skin
  • Excessive sweating

What Are the Symptoms of
An Underactive Thyroid?

An underactive thyroid or hypothyroidism is the most common thyroid disorder. Because your cells are working too slow as a result of too little thyroid hormones being produced, it can cause:

  • Feeling tired
  • Weight gain
  • Constipation
  • Depression
  • Dry skin
  • Low sex drive
  • Sensitivity to cold
  • Slow movements and thoughts
  • Brittle hair and nails
  • Irregular or heavy periods

Thyroid and Menopause

Some of the symptoms associated with thyroid disorders are similar to menopause symptoms. So, it’s common for these symptoms to be diagnosed as menopause or linked to stress.

For example, an underactive thyroid shares many symptoms with the menopause and hypothyroidism is most common in menopausal aged women. It is important to distinguish between the menopause and a thyroid issue or if, indeed, you are experiencing both. It’s particularly important because both can increase the risk of long-term health complications such as heart disease and osteoporosis.

A thyroid check analyses the levels of thyroid hormones in your blood and these can be used to identify thyroid conditions.

improve your unique self

Want to improve your health & wellbeing? Forth gives you insight into your body’s key biomarkers. By tracking essential markers overtime you can build a picture of your own unique self and discover how your body responds to the changes you make so you can reach your personal best.

Chose a health check

Order your home blood test online and we’ll deliver it straight to your letterbox.

Collect your sample

Our finger prick blood test kit has everything you need. Just collect your sample, and return it to our accredited lab, using the Tracked-24 envelope supplied.

Fast, accurate results

Your blood test results will be reviewed by our healthcare team and uploaded to your dashboard within 24-48hrs. Along with simple explanations and expert advice on how to make improvements.

Health Dashboard

View your results on our app and web platform, which gives you key information, bespoke advice, and allows you to dive deeper to find out more.

Advice by medical experts

We don’t just provide your levels and leave you to it; our team of medical experts interpret any out-of range results and provide advice specifically tailored to you.


Our app allows you to compare your biomarker results against other individuals of a similar age and gender, so you’re able to benchmark your health more accurately, and identify any areas that need improvement.

Track changes over time

One test is a snapshot, but test repeatedly over time and you’ll see how your body reacts, adapts and changes to elements like diet, exercise, supplements, and more. The more information you have, the clearer the picture of your own unique physiology, and the greater your understanding of what your body needs to perform at its best.

Fast & Accurate

Fast & accurate analysis from accredited laboratory.


Secure access to online results.


Convenient tests can be done at home.

Online Dashboard

Online dashboard which tracks results over time.

Frequently asked questions

Take the guess work out of your health. Here are some of the most frequently asked questions we get asked. If you need anything else try our help section.

  • What does the hormone TSH do?

    Thyroid-stimulating hormone (TSH) is produced by the pituitary gland and acts on the thyroid to stimulate it to produce the hormones thyroxine and triiodothyronine.

  • What is an overactive thyroid?

    An overactive thyroid, also known as hyperthyroidism,  means you have too much thyroid hormone acting on the cells in your body which speeds them up. Their increased function can cause a variety of symptoms, such as anxiety, fast heartbeat, weight loss, sleep disturbances, trembling, and excessive sweating.

  • What autoimmune conditions can cause thyroid disorders?

    Thyroid conditions can be caused by autoimmune diseases where your immune system mistakenly attacks its own cells resulting in an immune response and some unpleasant symptoms.

    Graves’ disease, for example, causes hyperthyroidism or an overactive thyroid. Because your immune cells attack the thyroid, it causes it to produce more thyroid hormones than your cells need and speeds up the rate at which they work. Whereas Hashimoto’s disease is an autoimmune condition that causes an underactive thyroid (hypothyroidism). It occurs when your immune system attacks the thyroid causing damage which results in not enough thyroid hormones being produced and slowing down your cells’ metabolism.

  • What is triiodothyronine?

    Triiodothyronine, also known as T3, is a hormone produced by your thyroid and affects nearly all of the processes in the body. It helps to regulate your metabolism, so how fast or
    slow your cells work.

  • What is an underactive thyroid?

    An underactive thyroid is also known as hypothyroidism and is caused by a lack of thyroid hormones. Because there aren’t enough thyroid hormones being made, the activity of your cells slows down and causes symptoms such as weight gain, low mood, and forgetfulness.

  • What are thyroid levels supposed to be?

    TSH – 0.27-4.2 mIU/L

    Thyroxine (FT4) – 12-22 pmol/L

    Triiodothyronine (FT3) – 3.1 – 6.8 pmol/L

    Please note reference ranges can vary by lab and analytical process.

Looking for a bespoke test?

Would you prefer to test more biomarkers at the same sample of blood? All our tests are customisable and can be tested in just one sample of blood. Click the button below to add more biomarkers to this test.