Thyroid function tests ( TFTs ) is a collective term for blood tests used to check the function of the thyroid.
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 and anxiety disorder.
Panel components
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)
- thyroxine (T 4 ),
- triiodothyronine (T 3 )
- Free hormones (direct measurements)
- Free T 4
- Free T 3
- Carrier proteins
- Thyroid binding globulin
- Transthyretin (prealbumin)
- Albumin
- Measures of protein binding of thyroid hormones
- T uptake
- Thyroid hormone binding ratio (THBR)
- Thyroxine-binding index (TBI)
- Calculated indices of free hormones
- Free T4 index
- Free T3 index
See also
- Reference ranges for blood tests#Hormones
References
- ^ Dayan CM (February 2001). "Interpretation of thyroid function tests". Lancet 357 (9256): 619–24. doi: 10.1016/S0140-6736(00)04060-5 . PMID 11558500 . http://linkinghub.elsevier.com/retrieve/pii/S0140-6736(00)04060-5 .
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