Thyroid function tests

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: TFTs

Overview

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.

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.