Free Thyroxine T4 Levels. Doctors in 147 specialties are here to answer your questions or. Thyroxine free the most active of t4.
This means your thyroid is not making enough hormones. Excess of it in any tests indicates the thyroid disorder. High levels of any of these tests (total t4, free t4, or free t4 index) may indicate an overactive thyroid, also known as hyperthyroidism.
Most of the t4 and t3 circulate in the blood bound to protein, while a small percentage is free (unbound).
Doctors in 147 specialties are here to answer your questions or. When combined with an elevated tsh level, a normal free t4 may indicate subclinical hypothyroidism. Your free t4 levels can give you amazing insight into how well your thyroid is functioning, but you need to remember that they are only a small piece of an even larger puzzle. Free thyroxine (free t4) tests are used to help evaluate thyroid function and diagnose thyroid diseases, including hyperthyroidism and hypothyroidism, usually after discovering that the thyroid stimulating hormone (tsh) level is abnormal.
