Free Thyroxine Index High. Fti = thyroxine (t4)/thyroid binding capacity. Fti increases could be caused by hyperthyroidism whilst decreased fti could be attributed to hypothyroidism.
The fti is a normalized determination that remains relatively constant in healthy individuals and compensates for abnormal levels of binding proteins. The fti is a normalized determination that remains relatively constant in healthy individuals and compensates for abnormal levels of binding proteins. The free thyroxine index (fti) is determined by the following calculation:
The free thyroxine index (fti) is determined by the following calculation:
< 115) thyroid peroxidase antibodies x 164 kiu/l (range: The free thyroxine index (fti) is determined by the following calculation: Elevated free thyroxine levels may indicate hyperthyroidism, thyroid hormone resistance syndrome, or thyroxine toxicosis. But the level of increase is not abrupt.
