Free Thyroxine Index Range. This finding suggests that patients with central hypothyroidism should be treated to achieve free thyroxine levels in the upper part of the reference range. How to calculate the free thyroxine index?
Similarly, in the case of hypothyroidism, the serum value falls below 3 µg%. May also include abnormal ranges. A free t4 measures what is not bound and able to enter and affect the body tissues.
This finding suggests that patients with central hypothyroidism should be treated to achieve free thyroxine levels in the upper part of the reference range.
Note additional information related to the test. The free thyroxine index (fti) is determined by the following calculation: The free thyroxine index (fti) is determined by the following calculation: Free thyroxine is often more useful than total thyroxine in assessing thyroid function.
