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Free T4

Supporting to diagnose and monitor thyroid disease and conditions

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Free T4 test measures the level of the hormone thyroxine (T4) in your blood.
The thyroid gland produces T4 in response to thyroid-stimulating hormone (TSH).
T4 is found in the body in two forms: free T4 and bound T4.
A total T4 test can measure the total amount of both free and bound T4 in the blood,
while a free T4 test will only measure the amount of T4 in its free form,
so it more accurately reflects how the thyroid gland is functioning.

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