Free triiodothyronine (Free T3)
Active thyroid hormone affecting metabolism. Used in detailed thyroid evaluation.
Free triiodothyronine (Free T3) is the unbound, biologically active form of triiodothyronine, a thyroid hormone produced in small amounts by the thyroid gland and primarily formed from the conversion of thyroxine (T4) in peripheral tissues.
Free T3 is responsible for most of the metabolic effects of thyroid hormones, including regulation of heart rate, body temperature, oxygen consumption, and energy metabolism. Because it represents the active hormone available to tissues, measuring Free T3 can provide important insights into thyroid function, particularly in complex or borderline cases.
Free triiodothyronine (Free T3)
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