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Thyroid Function with Antibodies Blood Test

Thyroid Function with Antibodies Blood Test


The Thyroid Function with Antibodies Blood Test checks your thyroid stimulating hormone (TSH), free T3 (FT3) and free T4 (FT4), as well as thyroid antibodies, for an in-depth picture of your thyroid health.
Blood sample 5 biomarkers included Results estimated in 2 working days from sample receipt at lab
Thyroid Function with Antibodies Blood Test
Thyroid Function with Antibodies Blood Test
Thyroid Function with Antibodies Blood Test
Thyroid Function with Antibodies Blood Test
Thyroid Function with Antibodies Blood Test

Is it for you?

This best-selling Thyroid Function with Antibodies Blood Test helps you to get a full picture of your thyroid health.

You may be experiencing symptoms of an overactive or underactive thyroid, leading to changes with your weight, mood, energy, skin and hair. Or you may have a family member with thyroid disease, and you want to see if you could also be affected. This test can help you to investigate a potential thyroid condition by testing three thyroid hormones as well as thyroglobulin and thyroid peroxidase antibodies.

What's included?

Biomarker profiles

  • Autoimmunity
  • Thyroid Hormones

Autoimmunity (2 Biomarkers)

Thyroid Hormones (3 Biomarkers)

Special instructions

Prepare for your Thyroid Function with Antibodies Blood Test by following these instructions. Please take your sample before 10am. 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.

From the expert

Many people begin their investigation into a potential thyroid condition with our Thyroid Function with Antibodies Blood Test. It offers a comprehensive investigation into the main thyroid hormones (TSH, FT4 and FT3) as well as thyroglobulin antibodies and thyroid peroxidase antibodies.

Thyroid conditions are very common but can be difficult to diagnose. Many of the symptoms of a thyroid disorder can be overlooked, especially if they are mild, or confused with other conditions. This test offers an affordable insight into what could be causing your symptoms by checking your levels of thyroid stimulating hormone (TSH), which is often abnormal in thyroid disease, free thyroxine (FT4) and free triiodothyronine (FT3). By measuring the amount of thyroid hormone that is "free" or unbound to carrier proteins in the blood, we can get a better picture of how much thyroid hormone is available to your cells. 

Many thyroid disorders are caused by an autoimmune disease and your risk for this is raised if you or a family member has a history of autoimmune disease. This test looks for specific thyroid antibodies which can indicate that your thyroid is under attack from your immune system.

Dr Sam Rodgers MBBS, MRCGP
Chief Medical Officer


Does everyone have thyroid antibodies?
No, not everyone has thyroid antibodies. If you do, it may be an indication of having, or being at risk of, an autoimmune disease and we may recommend discussing your results and symptoms with your doctor.

The thyroid antibodies that appear most frequently are:
  • Antithyroglobulin Antibody or TG Ab
  • Thyroid Stimulating Immunoglobulin or TSI Ab
  • Antithyroid Peroxidase Antibody or TPO Ab (also known as Antithyroid Microsomal Ab)
What does it mean when your thyroid antibodies are high?
Any level (titre) of antibody could be regarded as at least potentially suspicious of future illness. Certain levels of thyroid antibodies may indicate autoimmune disease such as Hashimoto’s disease, Graves’ disease or autoimmune thyroiditis.
When should you check thyroid antibodies?
If a member of your family has a thyroid condition, you have an existing autoimmune disease or you’re experiencing symptoms of an underactive thyroid or overactive thyroid, you may want to check your thyroid antibodies.

It is still possible to have raised levels of all three antibody types and not have any clinical symptoms. This result could indicate that you are at risk of developing a future thyroid condition and you should have follow-up checks to monitor your health.
What are thyroid peroxidase antibodies?
Antithyroid Peroxidase Antibody, or TPO Ab, is often raised in Hashimoto’s disease where the cells for the thyroid gland are attacked and slowly destroyed. Elevated levels are also raised in 65% of patients with Grave’s disease.

Read our Thyroid Health Guide for more information on diagnosing and managing a thyroid condition.

Why take this test?

  • Investigate a potential thyroid condition.
  • Check symptoms of an underactive or overactive thyroid.
  • Understand whether an autoimmune disease could be the cause of a thyroid disorder.
  • Monitor your thyroid hormones and thyroid antibodies.

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.