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Postal service updates: October - December

Advanced Thyroid Function Blood Test

Advanced Thyroid Function Blood Test


The Advanced Thyroid Function Blood Test takes a detailed look at your thyroid function, including antibodies and thyroid nutrition, for optimum thyroid health.
Blood sample 10 biomarkers included Results estimated in 2 working days from sample receipt at lab
Advanced Thyroid Function Blood Test
Advanced Thyroid Function Blood Test
Advanced Thyroid Function Blood Test
Advanced Thyroid Function Blood Test
Advanced Thyroid Function Blood Test

Is it for you?

This advanced thyroid test helps you to investigate several causes of thyroid-related symptoms.

By checking your thyroid hormones, thyroid antibodies and important vitamins and minerals, you can investigate whether your symptoms are caused by an overactive or underactive thyroid, an autoimmune condition or something else, like low levels of vitamins and minerals. If you have been diagnosed with a thyroid disorder, this test can also help you to make informed choices to optimise your nutrition and support your thyroid health.

What's included?

Biomarker profiles

  • Autoimmunity
  • Iron Status
  • Thyroid Hormones
  • Vitamins
  • Inflammation

Autoimmunity (2 Biomarkers)

Iron Status (1 Biomarker)

Thyroid Hormones (3 Biomarkers)

Vitamins (3 Biomarkers)

Inflammation (1 Biomarker)

Special instructions

Prepare for your Advanced Thyroid Function Blood Test by following these instructions. Please take your sample before 10am. Take this test when any symptoms of short-term illness have settled. You should take this test before you take any medication or vitamin/mineral supplements. Do not take biotin supplements for two days before this test, discuss this with your doctor if it is prescribed. Do not take vitamin B12 for two weeks prior to this test. If your B12 is prescribed ask your doctor whether to stop.

From the expert

Our Advanced Thyroid Function Blood Test contains everything you need to give you a clear picture of your thyroid health. This profile includes tests for thyroid stimulating hormone (TSH), thyroid hormones (FT4 and FT3) and thyroid antibodies (thyroglobulin antibodies and thyroid peroxidase antibodies) for a thorough investigation of thyroid function and autoimmune disorders which could be causing your symptoms. Importantly, it also tests for free triiodothyronine (FT3) and the more biologically active free thyroxine (FT4), which could help to explain any symptoms you may have. 

This profile includes important vitamins and minerals which not only support your thyroid function, but which can also mimic the symptoms of an underactive thyroid if they are found to be low. We include tests for vitamin D, vitamin B12 and folate (vitamin B9) and ferritin (a marker for iron storage). We also include an inflammation marker to help interpret your iron (ferritin) result as well as give a picture of whether an autoimmune condition is causing inflammation in your body.

Dr Sam Rodgers MBBS, MRCGP
Chief Medical Officer


How do you test your thyroid?
If you are experiencing thyroid-related symptoms, such as changes with your weight, energy, mood, skin or hair, then a thyroid blood test will help you to test your thyroid function. We have three popular thyroid tests to help you understand whether you have the right level of thyroid hormones for a healthy metabolism.
What is the best blood test for thyroid?
Private thyroid tests can give you access to the full range of thyroid hormones, thyroid antibodies and nutrients that can affect your thyroid health, together with the added advantage of a convenient and speedy service. The blood tests available from your GP often only routinely test your thyroid stimulating hormone (TSH) and free thyroxine (FT4).

Look at the different types of thyroid blood tests with our Thyroid Buying Guide.
Does fasting affect thyroid blood test?
In general, you do not need to fast before a thyroid blood test. If you are required to fast, you will be told in advance. It is best to fast overnight and take your test in the morning so that you don’t have to go too long without eating.

It is, however, very important to make sure that you are well-hydrated before taking a blood test. Read our top tips for taking a finger-prick blood test or look at our Frequently Asked Questions for more information.
How do you test for underactive thyroid?
The best way to test for an underactive thyroid is through a thyroid blood test. However, it isn’t always enough to just focus on thyroid function. Symptoms which may be associated with an underactive thyroid could also be caused by other conditions such as iron deficiency anaemia, a nutritional deficiency or a hormone imbalance.

To diagnose an underactive thyroid, your doctor will look at your symptoms together with the results of blood tests that measure the level of your thyroid hormones.

Why take this test?

  • Monitor your thyroid function over time.
  • Investigate symptoms that may be thyroid related.
  • Get a comprehensive view of your thyroid function.
  • Optimise your nutrition to support your thyroid health.

Laboratories you can trust

Trusted by the NHS and private clinics alike, you can be sure of the highest testing standards from our UKAS accredited partner laboratories.

Dr Sam Rodgers - Chief Medical Officer

Expert advice with your results

Get trusted advice and comments from one of our doctors based on your results.

Your personal health centre

Your personal health centre

Discover the easy way to track your health through our online portal, View your results with doctor's advice, monitor any changes over time and see the improvements you can make to your health with simple lifestyle changes.

Questions? Let us help
Questions? Let us help

Questions? Let us help

Our customer care team is on-hand to help you find the test that's right for you. Get in touch via phone, live chat or email.


Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.