Thyroxine Free T4 Range. Free thyroxine (free t4) optimal range: Is apple cider vinegar good for your thyroid.
Thyroxine, secreted by the thyroid gland mostly circulates bound to serum proteins (75% thyroxine binding globulin, 15%. Your results may be described as free t4 or free thyroxine index (fti). However, it’s important to note that different labs and doctors may have a varying “normal range.”
The normal level of free thyroxine in the body of an adult is 0.8 to 2.8 nanograms per deciliter (ng/dl).
Combining a free t4 test with a tsh test gives the most accurate insight into how the thyroid is functioning. This study showed that, while treating patients with hypothyroidism, the goal should be to obtain a free thyroxine level in the upper part of the reference range. Almost all of the t4 in the blood (99.97%) is bound to blood proteins, but only the unbound t4 is active. The normal range for the free t4 index is between 1.1 to 4.3 mcg/dl.
