Free Thyroxine Index Labcorp. This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin b7 or b8, vitamin h, or coenzyme r). The free thyroxine index (fti) is determined by the following calculation:
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Fti = thyroxine (t4)/thyroid binding capacity. Abnormal total and free triiodothyronine concentrations may appear in t 3 toxicosis, in the presence of normal thyroxine levels. About the t4 blood test
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Reference range 4.5 to 12.0 ug/dl; Reference range 4.5 to 12.0 ug/dl; Please provide service area information to confirm test code for the lab that services. Fti = thyroxine (t4)/thyroid binding capacity.
