Free thyroxine (Free T4)
Unbound thyroxine hormone. Low levels suggest hypothyroidism, high indicate hyperthyroidism.
Free thyroxine (Free T4) represents the fraction of thyroxine hormone that is not bound to proteins in the bloodstream and is therefore biologically active. It is produced by the thyroid gland and plays a crucial role in regulating metabolism, body temperature, heart rate, and energy production.
Free T4 enters tissues and is converted into triiodothyronine (T3), the more active thyroid hormone. Measuring Free T4 provides a more accurate assessment of thyroid function than total T4, especially in conditions that affect protein binding.
Free thyroxine (Free T4)
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