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
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