A free triiodothyronine (free T3) test is used to assess thyroid function. This hormone helps the body to regulate energy and has also a role in controlling weight, body temperature, muscle strength, and nervous system.

The T3, Free (FT3) test measures serum triiodothyronine (T3) not bound to thyroid hormone-binding proteins (thyroid hormone-binding globulin [TBG], transthyretin, albumin). It is used, primarily in concert with measurement of thyroid-stimulating hormone (TSH) and free T4 (FT4), in the diagnosis and management of hyperthyroidism and to clarify thyroid hormone status in the presence of a possible thyroid hormone-binding protein abnormality.

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