Endocrinology Book

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Free Thyroxine IndexAka: Free T4 Index, FTI, FT4I

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  1. Normal
    1. Free Thyroxine Index: 4-11
  2. 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
  3. Measurement
    1. Calculated: T4 x T3 Binding Ratio (T3RU)

Free thyroxine index test (C0202024)

ConceptsLaboratory Procedure (T059)
EnglishFree thyroxine index, Free thyroxine index level, Free thyroxine index test, FT4 index, FT4I, FTI, FTI - Free thyroxine index
Spanishindice de FT4, indice de tiroxina libre
Parent ConceptsChemical procedure (C0201682), Biochemical test (C0430027), Thyroid hormone measurement (C0430083)
SourcesMTH, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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