Free Thyroxine Index High. A high tsh level indicates that the thyroid gland is not making enough thyroid hormone (primary hypothyroidism). The free thyroxine index (fti) is determined by the following calculation:
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The fti is a normalized determination that remains relatively constant in healthy individuals and compensates for abnormal levels of binding proteins. The fti is considered a more reliable indicator of thyroid status in the presence of abnormalities in plasma protein binding. The free thyroxine level is higher than the normal level during pregnancy.
Interassay precision (cv) is <5%.
If there are symptoms of hyperthyroidism noticed, the doctor recommends taking the free thyroxine test to confirm hyperthyroidism. The free thyroxine index (fti) is determined by the following calculation: The free thyroxine level is higher than the normal level during pregnancy. Interassay precision (cv) is <5%.
