Thyroid function tests
Thyroid function tests (TFTs) is a collective term for
blood tests used to check the function of the thyroid.
A TFT panel typically includes
thyroid-stimulating hormone(TSH, thyrotropin) and thyroxine(T4), and triiodothyronine(T3) depending on local laboratory policy.Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid.
A TFT panel may include:
* Circulating concentrations of:
** Total Hormones
thyroid-stimulating hormone(TSH, thyrotropin)
** Free hormones (direct measurements)
*** Free T4
*** Free T3
** Carrier proteins
Thyroid binding globulin
* Measures of protein binding of thyroid hormones
Thyroid hormone binding ratio(THBR)
* Calculated indices of free hormones
Free T4 index
Free T3 index
TFTs may be requested if a patient is thought to suffer from
hyperthyroidism(overactive thyroid) or hypothyroidism(underactive thyroid), or to monitor the effectiveness of either thyroid-suppression or hormone replacement therapy. It is also requested routinely in conditions linked to thyroid disease, such as atrial fibrillation.
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