II. Interpretation: Normal

  1. Free Thyroxine Index: 4-11

III. Indications

  1. Largely replaced by Free T4 (Free Thyroxine)
  2. Corrects for abnormal Thyroid Binding Globulin (TBG)
  3. Free T4 also corrects for Thyroid Binding Globulin
    1. Free T4 is preferred over FTI

IV. Measurement

  1. Calculated: T4 x T3 Binding Ratio (T3RU)

Images: Related links to external sites (from Google)

Ontology: Free thyroxine index test (C0202024)

Concepts Laboratory Procedure (T059)
SnomedCT 143690007, 166333003, 39700003
Italian Indice di tiroxina libera
Japanese 遊離サイロキシンインデックス, ユウリサイロキシンインデックス
Spanish Free thyroxine index, Free thyroxine index (& level), índice de FT4, índice de tiroxina libre (procedimiento), índice de tiroxina libre, Índice de tiroxina libre
English free thyroxine index (lab test), free thyroxine index, Free thyroxine index (& level) (procedure), Free thyroxine index test, FTI (free T4 index), FTI (free thyroxine index), free T4 index, free thyroxine index test, Free thyroxine index, FT4 index, FTI, FT4I, FTI - Free thyroxine index, Free thyroxine index level, Free thyroxine index (procedure), Free thyroxine index (& level)
Czech Index volného tyroxinu
Hungarian Szabad tiroxin index
Portuguese Índice de tiroxina livre
Dutch vrij-thyroxine-index
French Index de thyroxine libre
German Freies Thyroxin-Index