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BioSURE Thyroid Function Test - TSH, T3 & T4

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Measures 3 key biomarkers to let you know if your thyroid is functioning correctly.

Why you need it:

  • This test is essential for a comprehensive assessment of thyroid function, analysing three key biomarkers: Thyroid Stimulating Hormone (TSH), Free T4, and T3. These biomarkers provide a detailed picture of thyroid activity.
  • An underactive or overactive thyroid can manifest in symptoms such as mood swings, tiredness, anxiety, depression, and weight-related issues. This test aids in identifying specific biomarker levels associated with these symptoms.
  • This test allows individuals to assess their thyroid function and detect any abnormalities early on, enabling timely interventions and lifestyle adjustments to maintain optimal thyroid health.

Why we love it:

  • We appreciate that this test focuses on three key biomarkers—TSH, Free T4, and T3. This focused approach ensures a detailed and specific analysis of thyroid function, providing nuanced insights that contribute to a more accurate assessment.
  • The test is designed as a user-friendly blood test, offering a convenient and accessible method for individuals to assess their thyroid function. Blood tests are commonly used in healthcare, and this familiarity enhances the ease of use for individuals.
  • The inclusion of three key biomarkers in the analysis enhances the depth of information provided, giving users a clearer understanding of their thyroid health and fostering a sense of empowerment over their well-being.

What it is (and why):

  • The primary component is the thyroid function test kit, containing all the necessary materials for collecting a blood sample to measure TSH, Free T4, and T3 levels. This kit ensures a straightforward and user-friendly process for individuals.
  • The package includes information about the three key thyroid biomarkers—TSH, Free T4, and T3. This educational content enhances users' understanding of these biomarkers, their roles in thyroid function, and how their levels can impact overall health.
  • The kit includes a detailed test results report, presenting the levels of TSH, Free T4, and T3. This report provides a comprehensive overview of thyroid function, aiding users in interpreting the results and making informed decisions about their health.
how to use


A kit containing everything you need is sent to an address of your choice.

You can then take a simple finger prick sample, using the lancets provided and collect the drops into the tube. You then register it on-line and post it off to the laboratory using the Royal Mail 1st Class Tracked envelope that is included with your kit.

Your full report, showing your results and how they compare with the normal reference ranges, are reported back to you by email. You will receive your result the day after the lab receives your sample.

All test results are reviewed by BioSURE's in-house GPs who highlight any areas of concern of that might need further investigation and follow up with a doctor.



Your BioSURE Self Test kit contains -

  • Instructions for Use
  • Collection tube(s)
  • Alcohol wipe x 2
  • Lancet x 4
  • Collection tube label(s)
  • Pre-paid return packaging
BioSURE Thyroid Function Test - TSH, T3 & T4
BioSURE Thyroid Function Test - TSH, T3 & T4
BioSURE Thyroid Function Test - TSH, T3 & T4
BioSURE Thyroid Function Test - TSH, T3 & T4
BioSURE Thyroid Function Test - TSH, T3 & T4
BioSURE Thyroid Function Test - TSH, T3 & T4
BioSURE Thyroid Function Test - TSH, T3 & T4
  • Thyroid stimulating hormone (TSH), T3, T4

  • Fingerprick blood sample

  • Lab test - results within 48 hours

Very easy to follow instructions. Posted off and got the results 2 days later. Clear and easy to understand the report. For things that showed high levels it told you what could cause the problem and what you can do about it.
I was very pleased and will be taking up a couple of things with my GP that I would not have known about unless I’d taken this test.
Would definitely do another one.

Samantha Moore

Great efficiency from BioSure, order arrived before the week was out. Very discreet as well.
Test was very easy to perform with crystal clear instructions.
Results within 15 mins, in the comfort of your own home without the stress or anxieties of alternative options.
Thank you very much BioSure!


Excellent, fast delivery, packaging comes through letter box friendly and discreet. i have used this test a couple of times now and its so simple to use and there is no mess or anything. (The plaster is a nice addition too). Will always use Biosure as its reliable and incredibly simple to follow.

Author's name

Frequently asked

What is the Biosure Thyroid Function self test?

Many thyroid tests only analyse 2 biomarkers (THS & FT) but this BioSURE test detects the three key biomarkers, so you will have a comprehensive picture of how your thyroid is working.

Having an overactive thyroid (hyperthyroidism) or an underactive thyroid (hypothyroidism) can cause a wide range of symptoms.

Knowing your levels will tell you whether you are in the normal range and advise you whether you should seek medical advice and treatment.

Why should I take a thyroid function self test?

The thyroid hormone plays a significant role in regulating your body's metabolism, which include your body temperature, how you convert food into energy and even your brain function and heart rate. If there is not enough thyroid hormone then your body slows down, and if there is too much then everything speeds up.

If you are suffering from common symptoms caused by an over active or under active thyroid gland, then it is a good idea to check. These symptoms can include tiredness (fatigue), changes in body temperature, mood swings, trouble sleeping, or muscle weakness.

There are some conditions that make people more likely to have thyroid problems, including Type 1 diabetes and Coeliac disease.

This test can also be used if you have a diagnosed thyroid problem to monitor your levels.

Do I need to fast for this test?

No, you do not need to fast for this test, but it is recommended that you take your sample first thing in the morning.

What is hyperthyroidism?

Hyperthyroidism is when your thyroid gland is overactive, so it will produce too much thyroxine. This can affect almost every organ in your body as it is the hormone that controls metabolism.

Symptoms can include unintentional weightloss and increased appetite (even when you are eating the same amount of food), irritability, anxiety and mood swings and pounding of your heart (palpitations), an irregular heartbeat (arrythmia) or a racing heart of more than 100 beats per minute (tachycardia).

If it is left untreated, hyperthyroidism can cause serious health issues and also affect your menstrual cycle and fertility.

There are several treatments for hyperthyroidism, with the most common being antithyroid drugs.

What is hypothyroidism?

Hypothyroidism is when your thyroid gland is underactive and does not produce enough thyroxine. This makes your metabolism slow down and affects your entire body..

The most common symptoms are weight gain even when your food intake does not increase and fatigue or extreme tiredness. Other symptoms include depression, increased sensitivity to cold, dry skin and a puffy face, and muscle aches and pain or stiffness in your joints.

Severely low thyroid levels (myxedema) can be very serious and cause a very low body temperature, confusion, heart failure and coma.

Overtime if left untreated, hyporthyroidism can cause obesity, heart disease and infertility.

An underactive thyroid is quite common and very good treatment is available. This is usually a synthetic thyroid hormone, levothyroxine, taken orally, that restores your hormone levels quickly.

What are normal levels of TSH, T4 and T3?

These ranges are a guide for general population and will be different for pregnant women and children.

TSH (Thyroid Stimulating Hormone) 0.4 to 4.0 mU/l (milliunints per litre )

FT4 (Free Thyroxine) 9.0 to 25.0 pmol/l (picomoles per litre)

FT3 (Free Triiodothyronine) 2.3 - 4.1 pg/mL (picograms per milliliter)

What are the symptoms of an overactive thyroid?

Overactive thyroid is also called hyperthyroidism.

Symptoms of an overactive thyroid can include -

  • mood swings
  • anxiety and feeling irritable
  • difficulty sleeping
  • feeling twitchy or trembling
  • felling constantly tired and weak
  • an irregular or an unusually fast heart rate (palpitations)

Some people can also get a swelling in their neck caused by an enlarged thyroid gland. The medical name for this is goitre.

What are the symptoms of an underactive thyroid?

Underactive thyroid is also called Hypothyroidism.

Symptoms of an underactive thyroid can include -

  • Weight gain
  • Fatigue or extreme tiredness
  • Depression
  • Increased sensitivity to cold
  • Dry skin and a puffy face
  • Muscle aches and pain or stiffness in your joints

Overtime if left untreated, hyporthyroidism can cause obesity, heart disease and infertility.

What is the thyroid?

The thyroid is a small butterfly-shaped gland in your neck. It is just in front of your windpipe.

Your thyroid is responsible for releasing and controlling thyroid hormones that control your metabolism.

Your metabolism is the process in which your body changes food you eat into energy for your body.

Will my healthcare provider accept my results?

Yes, your healthcare provider will recognise your clinically-valid results.

Early diagnosis is key to managing any health condition and means an increased range of treatment options, improved long-term health and improved quality of life.

It is unlikely to gain a definitive diagnosis from a blood-test but your results can be used to have informed discussions with your healthcare provider.

How do I receive my results?

Your results link will be sent to you via email, so you can log in to your secure account and view your results.

Your results include your levels and where they sit against 'normal levels'. There is also a visual interpretation as a colour coded graph so they are easy for you to understand.

How long does it take to receive my results?

Your blood sample will typically be processed in the laboratory within 24 hours of receipt on all working days. You will receive an email with a secure link through to your account and your results.

It is very important you scan your unique QR code when you open your kit, as this is what links your sample and your result to you. Without this BioSURE won't be able to send you your result.

Are my results accurate?

Yes, your samples are processed in the same laboratories that are used by hospitals and primary care providers. All of BioSUREs labs are UKAS and ISO accredited, which are the highest levels of accreditation.

When should I collect and return my sample?

BioSURE advise collecting your fingerprick blood sample in the morning, especially for tests that require fasting. Return on the same day in the pre-paid packaging that is supplied with your kit.

BioSURE also advise not collecting or returning your sample on Friday, Saturday or Sunday, so the lab receives it in the best possible condition.

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