Thyroid function tests are currently the most accurate way to diagnose and manage thyroid disorders. Your doctor will interpret the blood test results, together with your symptoms and how you feel, to reach a diagnosis to manage your treatment.
|TSH||0.4||4.5||mU/L (milliunits per litre)|
|FT4||9.0||25.0||pmol/L (picomoles per litre)|
|FT3||3.5||7.8||pmol/L (picomoles per litre)|
These ranges are only a guide. The reference range for FT4 in particular does currently vary between methods and so any 'typical' reference range quoted will be subject to method and local interpretation
A high TSH level with a low FT4 level: Hypothyroidism (under-active thyroid)
A low TSH level with a high FT4 level and a high FT3 level: Hyperthyroidism (over-active thyroid)
Abnormal TSH levels together with normal FT4 levels indicate you may be at risk of developing a thyroid disorder
A low TSH levels together with a low FT4 levels can indicate a disorder of the pituitary gland
If you have a diagnosed thyroid disorder, thyroid function tests will
It is well recognised that thyroid problems often run in families and if family members are unwell they should be encouraged to discuss with their own GP whether thyroid testing is warranted
|Download Quick Guide pdf|
We are currently receiving a high volume of medical queries electronically. We are therefore only able to reply medical queries sent by members of the BTF at present. We do however have a comprehensive range of guides on thyroid disorders and treatments available to download for free:
Access our guides to thyroid disorders and treatments.
Download our free factsheet on thyroid and diet.
Download a BTF membership form.
16 April 2015
Please take part in a short survey to submit questions or proposals that you consider important to be addressed in clinical trial.
31 March 2015
BTF Research Award 2015
Congratulations to Dr Carla Moran who has been awarded this year's Research Award for her work into hypothyroidism.
10 March 2015
Patient journeys - BTF films
We are delighted to have produced a series of short films featuring people talking about their experience of hypothyroidism, hyperthyroidism and thyroid cancer.
22 January 2015
Fight for Sight and BTF Co-fund New Research
A research grant co-funded by Fight for Sight and the British Thyroid Foundation has been awarded to researchers at London's NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology
15 December 2014
Thyroid cancer - patient journeys
BTF has produced four short films for patients with thyroid cancer. Please get in touch if you would like more information or support.
5 November 2014
Patient Knowledge of antithyroid drug-induced agranulocytosis - article published in the European Thyroid Journal.
July 2014 BSL Signed Information Clips
SignHealth have created a series of signed informational videos about thyroid issues. Find them on their website here
8 June 2014
Iodine supplements for a healthy thyroid
Information about the importance of taking iodine supplements and who needs them.
Drug Availability Updates
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British Thyroid Association British Thyroid Association - medical professionals encouraging the highest standards in patient care and research.
British Association of Endocrine and Thyroid Surgeons - the representative body of British Surgeons who have a specialist interest in surgery of the endocrine glands (thyroid, parathyroid and adrenal)