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Free Thyroxine Index
Aka: Free Thyroxine Index, Free T4 Index, FTI, FT4I- Normal
- Free Thyroxine Index: 4-11
- Indications
- Corrects for abnormal Thyroid Binding Globulin (TBG)
- Free T4 also corrects for Thyroid Binding Globulin
- Free T4 is preferred over FTI
- Measurement
- Calculated: T4 x T3 Binding Ratio (T3RU)