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Advanced Thyroid Check

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Results within 2 working days
Our at home 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
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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
Dr Nicky Keay
the Experts Opinion

“Thyroid disorders are quite common, affecting around 5% of the UK population with women being more prone to thyroid disorders than men. If you are experiencing symptoms of fatigue, mood changes, poor sleep or unexplained weight gain or loss then you may have a thyroid issue. This advanced thyroid test can be easily done at home and will help identify a thyroid disorder. It checks your levels of TSH, T4, T3 as well as thyroid antibodies. High T3 and T4, combined with low levels of TSH are indicative of an overactive thyroid, whereas low levels of T3 and T4 with high levels of TSH are associated with an underactive thyroid. NICE set TSH levels above 10 mU/L as indicative of hypothyroidism.”

Dr Nicola Keay
Forth Chief Medical Officer

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.

Frequently asked questions

 Here are some of the most frequently asked questions. 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.

Want To Personalise Your test?

Would you prefer to test more biomarkers in 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.