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Free Thyroxine IndexAka: Free T4 Index, FTI, FT4I

Normal
1. Free Thyroxine Index: 4-11
Indications
1. Corrects for abnormal Thyroid Binding Globulin (TBG)
2. Free T4 also corrects for Thyroid Binding Globulin
  1. Free T4 is preferred over FTI
Measurement
1. Calculated: T4 x T3 Binding Ratio (T3RU)

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This page was written by Scott Moses, MD, and was last revised 1/26/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 5.0.