Thyroxine (T4)
Current as of: November 6, 2018
Author: Healthwise Staff
Medical Review:E. Gregory Thompson, MD – Internal Medicine & Kathleen Romito, MD – Family Medicine & Adam Husney, MD – Family Medicine
Thyroxine (T4) is the most common form of thyroid hormone that is released by the thyroid gland. Once it reaches the tissues, it is converted to another form of thyroid hormone called triiodothyronine (T3), which is more active in regulating the body’s chemical reactions. In tests of thyroid function, a low T4 level may…