Free Thyroxine Index Calculation. Fti = thyroxine (t4)/thyroid binding capacity. Some suggest that tsh levels of over 2.5 milliunits per liter (mu/l) are abnormal, while others consider levels of tsh to be too high only after they have reached 4 to 5 mu/l.
The fti is a normalized determination that remains relatively constant in healthy individuals and compensates for abnormal levels of binding proteins. Aliases other names that describe the test. David baorto, md, phd date written:
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Includes t4, t4 uptake, and calculation of fti. Plex whereas the smaller molecular fragments may act as. Copy this information to the clipboard: The fti is a normalized determination that remains relatively constant in healthy individuals and compensates for abnormal levels of binding proteins.
