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  • Anonymous
      Post count: 93172

      According to my reference book, the FTI or T7 test (apparently equivalent designations) is a mathematical calculation used to correct the estimated total thyroxine (T4) for the amount of thyroxine-binding globulin (TBG) present. In order to make the calculation, the lab finds the total T4 value and the T3 uptake ratio, and multiplies them together. “The FTI is useful in the diagnosis of hyper- and hypothyroidism, especially in patients with known or suspected abnormalities in thyroxine-binding protein levels. In such patients, blood levels and clinical signs may seem contradictory unless both T4 and TBG are considered as interrelated parameters of thyroid status.” And “The free thyroxine index permits meaningful interpretation by balancing out most nonthyroidal factors.” (From A Manual of Laboratory & Diagnostic Tests, 5th edition, by Frances Fischbach).

      So, there isn’t a thyroid hormone called T7, and I haven’t a clue why the test is designated as such.

      Bobbi

      Anonymous
        Post count: 93172

        Last week I was discussing my last bloodwork results with my doctor. She said that my T-4 and T-7 were both in the normal range. I asked about T-3, and she said they tested T-7 instead. I hadn’t even HEARD of T-7. Anyone know anything? She hadn’t ordered a TSH test and decided maybe she should since I still feel crummy, so back I go to the lab!

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