Your everyday doesn't have to be so tiring. Checking your thyroid could hold the answers to better skin, losing weight and getting your energy back. Find the right test for you below.
Essential Tests

A popular at-home finger-prick thyroid blood test which examines levels of TSH and free thyroxine (FT4) to help in the diagnosis of a thyroid disorder.
check_circle 2 tests included
invert_colors Blood sample
schedule 2 day turnaround

Most thyroid hormones are bound to proteins - this blood test examines the level of free, or unbound, T3 (triiodothyronine), the active form of T3.
check_circle 1 test included
invert_colors Blood sample
schedule 2 day turnaround
Thyroid Profiles

A thorough look at your thyroid function as well as key B vitamins, iron storage and inflammation.
check_circle 9 tests included
invert_colors Blood sample
schedule 2 day turnaround

Our best-selling thyroid blood test which includes thyroid hormones and thyroid antibodies for an in-depth picture of your thyroid function.
check_circle 5 tests included
invert_colors Blood sample
schedule 2 day turnaround

This is the perfect check to get an overall picture of your thyroid function. With tests for TSH, FT4 and FT3, find out if you have the right level of thyroid hormones for healthy metabolism.
check_circle 3 tests included
invert_colors Blood sample
schedule 2 day turnaround
Advanced Thyroid

Our advanced thyroid profile takes a detailed look at your thyroid function including antibodies as well as thyroid nutrition for optimum thyroid health.
check_circle 10 tests included
invert_colors Blood sample
schedule 2 day turnaround
About Thyroid Health

Our range of thyroid checks is for people who want to diagnose or to monitor a thyroid condition. Our comprehensive range of tests includes the full list of thyroid hormones as well as antibodies and related tests making it easier than ever to get the full picture of your thyroid health. 

The thyroid is a butterfly-shaped gland which is situated in the front of your neck and wraps around your windpipe. Its job is to produce the hormones which govern metabolism - if excess levels of thyroid hormones are produced your metabolism speeds up which means that many of your bodily functions also speed up. You may be aware of your heart beating faster, of food moving through your digestive tract too quickly leaving you with diarrhoea, of your temperature being raised or you may feel constantly anxious or jittery. This is called hyperthyroidism or, in more familiar terms, an overactive thyroid.

More commonly, the thyroid gland doesn't produce enough thyroid hormones which results in your metabolism slowing down. An underactive thyroid is known as hypothyroidism and a classic symptom is the inability to lose weight. This is certainly a problem with an underactive thyroid but did you know that hair loss, constipation, dry skin and even libido and fertility problems can be attributed to an underactive thyroid?

See our symptoms section for a comprehensive list of symptoms that might be affecting you. 

Thyroid hormones

The thyroid gland uses iodine from the food we eat to produce two thyroid hormones: thyroxine (known as T4 because it contains 4 atoms of iodine) and triiodothyronine or T3 (because it has 3 atoms of iodine). Only T3 is biologically active in our cells (controlling metabolism, the process which converts oxygen and calories to energy) which means that T4 must be converted to T3 before your body can use it. 

Thyroid hormone production is governed by the pituitary gland which is situated at the base of your brain. It receives information about the amount of T4 and T3 circulating in your bloodstream and, if levels are low, releases thyroid stimulating hormone (TSH) to stimulate the thyroid gland to produce more. A blood test to measure TSH is often used to determine thyroid activity - a low TSH reading signals that thyroid hormones are elevated whereas a raised TSH result could mean that your thyroid gland is struggling to produce the required levels of hormones. Many experts believe that a TSH reading on its own is not sufficient to make a diagnosis of thyroid disease, and that a more comprehensive picture is obtained from blood tests which include T4 (total and free),  free T3 as well as thyroid antibodies.

So what goes wrong?

Thyroid problems can occur if at any stage of the process something goes wrong; for example, if the pituitary gland fails then it will not release enough TSH to regulate thyroid production or if you don't consume enough iodine in your diet (not a common problem in the UK) then your thyroid may be unable to produce sufficient amounts of thyroid hormones. A common cause of thyroid disorders is autoimmune disease which is a disorder of the immune system. Instead of attacking "foreign" invaders, your immune system mistakes your own cells as "foreign" and begins attacking them instead. Autoimmune diseases are common and range from psoriasis, rheumatoid arthritis, lupus, coeliac disease and multiple sclerosis. If you or a close family member suffers from an autoimmune disease this raises your risk of thyroid disease.

Hashimoto's thyroiditis or Hashimoto's disease is the name given to an underactive thyroid caused by an autoimmune disorder. In this case your immune system attacks the cells of the thyroid gland leaving them unable to produce thyroid hormones. 

Graves' disease is the name given to an overactive thyroid caused by an autoimmune disorder. In this case, the immune system creates antibodies which the thyroid gland responds to by producing excess levels of thyroid hormones.

Other problems can result from the poor conversion of T4 to T3 or because of stress which causes your body to deliberately slow your metabolism. Whatever the problem, blood tests can help to find the answer. 

Getting a diagnosis

For many people a simple blood test for TSH and free T4 can lead to a diagnosis of thyroid disease. For others, however, getting a diagnosis can be more difficult. Sometimes blood test results are within the normal range but symptoms persist. This is why it is often important to dig deeper to find out what might be causing your symptoms. We've created profiles which include tests for the key thyroid hormones as well as important nutritional tests; we've made all the thyroid hormones available as single tests; and we've included a long list of vitamins and minerals which may affect your thyroid function.


For many people a thyroid disorder can be treated very easily and simply either by replacing thyroid hormones or by taking anti-thyroid medication. For others, getting the right balance of hormones is a long process of trial and error until they get the right medication and dosage to relieve their symptoms. Thyroid function tests are especially important in this process to monitor how your thyroid hormone levels are responding to treatment. Our monitoring profiles are designed to give you important information about your hormone status during treatment.




Thyroid disorders aren't always easy to diagnose and treat, but the more you learn about how your thyroid functions and what factors can undermine the delicate balance of your thyroid hormones, the better equipped you'll be to manage your condition. Read our Frequently Asked Questions to get the answers that will help you understand your thyroid disorder.

Raised thyroid antibodies mean that your thyroid gland is under attack from your immune system - it is a very common cause of an underactive thyroid (Hashimoto's thyroiditis). If your antibodies are raised but your hormone levels are still within the normal ranges it indicates that your thyroid gland hasn't suffered too much damage and is still able to produce thyroid hormones. Your doctor will normally want to monitor your condition - should your thyroid begin to fail you can be treated with thyroid medication. Raised thyroid antibodies are also seen in almost 80% of Graves' disease sufferers, where an autoimmune response causes the thyroid gland to produce excess levels of thyroid hormones.
Iodine is necessary for thyroid function as it is required for the production of thyroxine (T4). However, because most cases of thyroid disease in the UK are caused by damage to the thyroid gland from the body's own immune system rather than a shortage of iodine, eating an iodine-rich diet will probably have little impact. If you are taking replacement thyroid hormones you will not need iodine and supplementing with iodine may actually do more harm than good. People with Graves' disease should not take supplements of iodine or eat iodine-rich foods. In parts of the world where iodine deficiency is more common it can be a leading cause of hypothyroidism. Foods containing iodine include kelp and other sea vegetables, fish, seafood, milk and eggs.
It is not unusual to feel symptoms which could be related to your thyroid even when your thyroid hormones are within the normal ranges. Some people report thyroid symptoms when their thyroid antibodies are elevated, even though their thyroid function is still normal. We recommend regular thyroid monitoring if this applies to you, as many people with elevated antibodies go on to develop a thyroid disorder. There are other conditions which can cause similar symptoms to thyroid disease. Once a thyroid condition has been ruled out, it is possible to investigate other causes of your symptoms.
Your blood test results indicate hypothyroidism. A raised TSH (thyroid stimulating hormone) reading means that your pituitary gland is stimulating the thyroid gland to produce more thyroid hormones because your levels of thyroid hormones are too low. This is supported by your low T4 (thyroxine) result. You may wish to have a thyroid antibodies test to confirm the diagnosis and establish the cause - e.g. an autoimmune disease such as Hashimoto's thyroiditis, a common cause of an underactive thyroid.
The key to treating hyperthyroidism is to prevent the thyroid gland producing excessive quantities of thyroid hormones. This may be achieved by prescribing anti-thyroid medication such as Carbimazole, by destroying part of the thyroid gland with radioactive iodine, or through a thyroidectomy, whereby the thyroid gland is surgically removed.
Sub-clinical hypothyroidism means that your blood test results show elevated levels of thyroid stimulating hormone (TSH) (indicating that your thyroid is being stimulated to produce more thyroid hormones) but your levels of thyroid hormones (T4 and T3) are normal. This diagnosis raises your risk of becoming hypothyroid so it is important to monitor your thyroid hormones regularly to ensure that any changes which would require treatment are picked up immediately. Other conditions, such as raised cholesterol and inflammation, which are associated with hypothyroidism can also present with sub-clinical hypothyroidism.
Yes - these results indicate hyperthyroidism. A low TSH reading means that your pituitary gland detects high levels of circulating hormones in the blood and doesn't need to stimulate the thyroid to produce more. In many cases of an overactive thyroid, your thyroid gland is under attack from your own immune system and it responds by producing more thyroid hormones - levels of T4 become elevated as a result. An overactive thyroid causes many symptoms including raised temperature, rapid pulse, anxiety and tremors.
Some foods are goitrogenic which means that they may contribute to the formation of a goitre. These are foods in the brassica family and include broccoli, cabbage and brussels sprouts. Cooking reduces the impact of goitrogens on thyroid function so the risk of eating them is fairly low. Other foods you should avoid include soya which interferes with thyroxine absorption and foods high in iodine which can make your condition worse. If you are taking iron supplements they too can interfere with the absorption of thyroxine so it is advised to leave at least 4 hours between your medication and taking supplements which contain iron.

Hypothyroid symptoms

Extreme fatigue

Weight gain and difficulty losing weight

Feeling cold all the time

Cold hands and feet


Slow heartbeat

Low basal temperature


Loss of libido

Raised cholesterol

Hair loss (especially outer third of eyebrows)

Dry hair and skin

Brittle nails


Irregular and heavy periods


Mood swings

Brain "fog"

Fertility problems


Hyperthyroid symptoms

Feeling hyperactive

Weight loss despite increased appetite

Feeling warm and sweating excessively

Warm, clammy skin

Shortness of breath

Rapid heartbeat

Raised basal temperature


Raised libido


Thin, fly-away hair

Thin, itchy skin

Thickened nails

Frequent bowel movements and diarrhoea

Light, scanty periods

Tremor and shakiness

Gritty, protruding eyes


Fertility problems


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