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Free Thyroxine Testing (FT4)

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How to check your Free Thyroxine levels with a home finger-prick blood test kit

What Is A Free Thyroxine Test For?

A Free Thyroxine test is also known as a FT4 test.

Thyroxine (T4) is the most prevalent thyroid hormone produced by the thyroid gland.

It is responsible for many vital roles in the body including, metabolism, heart and muscle function, brain development and bone maintenance.

Measurement of Free Thyroxine (FT4) is used to assess thyroid health.

Buy Your Free Thyroxine Blood Test Online

Learn all about Free Thyroxine Testing:

Free Thyroxine Testing UK Statistics 2021

Icon For Free Thyroxine

10.8% of people tested have Free Thyroxine levels which are too low.

And 1.2% have levels that are too high.

The average Free Thyroxine result is 15.0 pmol/l
Note what is normal for you may differ for your age and gender.

Human female body

Women tend to have lower Free Thyroxine in their blood than men.

As many as one in seven women tested have low levels of Free Thyroxine

Normal range test results


of people have Free Thyroxine blood levels in the normal range. Do you?

Are you in the 88.0% with normal results?

What If Free Thyroxine Test Levels Are High?

What If Free Thyroxine Test Levels Are High?

High Free T4 results along with appropriate clinical symptoms may indicate an overactive thyroid gland (hyperthyroidism).

Abnormal thyroid function can have a wide range of effects on your body and should be investigated further by your doctor.

Note, although many medicines including certain contraceptive birth control pills, epilepsy drugs, and large doses of aspirin could interfere with Total T4 test results, in general, Free T4 levels are minimally affected by these medications. 


What If Free Thyroxine Test Levels Are Low?

What If Free Thyroxine Test Levels Are Low?

Low free T4 results along with appropriate clinical symptoms may indicate an underactive thyroid gland (hypothyroidism).

How To Test Free Thyroxine?

Health testing for Free Thyroxine levels in your blood

The Free Thyroxine (FT4) Test allows you to accurately check your levels of Free Thyroxine in a fingerprick blood sample.

You can check your Free Thyroxine levels by buying a home finger-prick blood test kit below. Your sample is then professionally analysed in an accredited laboratory for total reassurance. The Vitall Thyroid Function Home Test Kit includes a Free Thyroxine test and is available for just £59.

Please see the following test kits:

Other Biomarkers Often Tested With Free Thyroxine

Why Take The Free Thyroxine Test?

Our Thyroid Function home blood test kit checks the two key Thyroid Function hormones to confirm normal thyroid function and indicate an overactive or underactive thyroid.

Thyroid disorders affect one in twenty people in the UK. Are you one of them?

Take control of your health without any of the inconvenience of going to the doctors with one of Vitall’s at-home blood tests.

Who Should Take The Free Thyroxine Blood Test?

Assess thyroid function and indicate abnormal thyroid activity using a home finger-prick blood test kit.

You get the convenience of home testing with the reassurance of professional clinical analysis. Your results are delivered quickly & securely online.

This Thyroid Function Test is advised if you:

  • have a low sex drive & loss of libido;
  • are experiencing hair loss;
  • are overly sensitive to heat;
  • experience irregular periods;
  • experience poor memory;
  • experience tingling or pain in your hands;
  • experience unusual tremors;
  • find it difficult to sleep properly;
  • have a slower than normal pulse (heart rate);
  • have had weight gain;
  • have had weight loss;
  • have higher than normal heart rate;
  • have previously had borderline thyroid tests ;
  • often feel anxious for no reason;
  • struggle to gain weight;
  • suffer from chronic fatigue & tiredness;
  • suffer from constipation;
  • suffer from depression;
  • suffer from muscle cramps;
  • sweat excessively or have a fever;
  • want the convenience of home testing without waiting for a GP appointment;
  • need a high quality, clinically accredited test done in a professional clinical laboratory.

Take a complete health check-up with Vitall.

How Much Do Thyroid Function Tests Cost?

The Vitall thyroid function test is available online for just £59. Your home test kit will be dispatched by free first class post for delivery to your door.

For the best value testing you can also upgrade this thyroid function home test to tests which also measure other biomarkers, including:

When you checkout to buy your thyroid function test online we also offer additional options, including:

  • Upgrade to next day delivery of your home test kit for an additional £7.99.
  • Visit the Patient Reception in central London for just £25. Your thyroid function test sample can be collected by a qualified nurse for immediate analysis.
  • Have a nurse visit you to collect the sample for your thyroid function test, this is available within the M25 area for just £149.

Whichever option you choose at checkout, buying the best thyroid function test online in the UK with Vitall ensures high quality results from an accredited laboratory.

Take control of your health today with one of Vitall’s home blood tests.

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