Free T4 Thyroxine Normal. At your next visit with your doctor you may discuss getting free t4 and t3 ( liothyronine ) done for confirmation of normal status. A free t4 measures what is not bound and able to enter and affect the body tissues.
If your test indicates t4 thyroid level is above 1.8, you may have an overactive thyroid. Conditions associated with hyperthyroidism include graves disease, an autoimmune disorder. So, what ends up happening, is many patients get their thyroid checked which results in this tsh with reflex to free t4.
This test has few different names like free thyroxine or thyroxine screen, total t4 concentration, and free t4 or free t4 concentration.
Levothyroxine therapy and serum free thyroxine. Numerous factors such as illness, medications, and genetics can influence protein binding of t4. Free thyroxine is often more useful than total thyroxine in assessing thyroid function. Low levels of any of these tests (total t4, free t4, or free t4 index) may indicate an underactive thyroid, also known as hypothyroidism.
