Free T4 Thyroxine Normal. If your free thyroxine level is more than the normal range, it may result in hyperthyroidism whereas a lower level of free thyroxine level can result in hypothyroidism. The free t4 test measures the tiny amount of circulating t4 that is.
When they find that their tsh is abnormal the lab company will automatically order free t4. Excess of it in any tests indicates the thyroid disorder. The fti is a normalized determination that remains relatively constant in healthy individuals and compensates for abnormal levels of binding proteins.
Excess of it in any tests indicates the thyroid disorder.
If free t4 (thyroxine) is measured instead of total t4, the normal levels in adults are from 0.8 to 2 ng/ml. A free t4 measures what is not bound and able to enter and affect the body tissues. The normal range for free t4 in adults is 4.6 to 11.2 micrograms per deciliter (mcg/dl). The idea is that it saves on the cost of unnecessary lab tests because why would you need to see the free t4 if the tsh is normal?
