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Part Description

LP28551-7   Thyroxine free index
Free thyroxine index (FT4I, FTI) is calculated from total hormone (TT4) and any one of the thyroid hormone uptakes - see LOINCs 3050-2 (Triiodothyronine resin uptake, T3RU), 74794-9 (Thyroid hormone binding ratio, THBR), 74793-1 (Classic T-uptake), and 74795-6 (Total thyroxine binding capacity). It adjusts total hormone levels for the number of binding sites to provide a better picture of thyroid status than total hormone levels. Results may vary depending on which T-uptake is used. If that level of distinction is important, users should look to the associated T-uptake code. However, little reason exists to depend on a Free T4 index today now that Free T4 measures are widely available, accurate and more economical than measuring a T-uptake and a TT4. Source: Regenstrief LOINC

LOINC Names Get Info

Fully-Specified Name
Thyroxine free index:MCnc:Pt:Ser/Plas:Qn:Calculated
Long Common Name
Thyroxine (T4) free index in Serum or Plasma by calculation
Short Name
FT4I SerPl Calc-mCnc
Display Name
Free T4 index Calc [Mass/Vol]
Consumer Name Alpha Get Info
Free T4 Index, Blood

Part Model Get Info

  • Component
    Thyroxine free index
    LP28551-7
    • Analyte
      Thyroxine free index
      LP28551-7
      • Component Numerator
        Thyroxine free index
        LP28551-7
        • Component Numerator Core
          Thyroxine free index
          LP28551-7
        • Component Numerator Core Suffix
          NULL
           
      • Component Denominator
        NULL
         
        • Component Denominator Core
          NULL
           
        • Component Denominator Core Suffix
          NULL
           
    • Challenge
      NULL
       
    • Adjustment
      NULL
       
    • Count
      NULL
       
  • Property
    MCnc
    LP6827-2
  • Time
    Pt
    LP6960-1
  • System
    Ser/Plas
    LP7576-4
    • System Core
      Ser/Plas
      LP7576-4
    • Super System
      NULL
       
  • Scale
    Qn
    LP7753-9
  • Method
    Calculated
    LP6165-7

Basic Attributes

Class
CHEM
Type
Laboratory
First Released
Version 2.07
Last Updated
Version 2.73 (MIN)
Change Reason
FTI is fundamentally MCNC but many labs report as unit-less.
Order vs. Observation
Both
Common Test Rank Get Info
669

Formula (Readable)

FTI=(T4 concentration) x (% TU)/100 -- a pure fraction

Language Variants Get Info

TagLanguageTranslation
cs-CZCzech (Czechia)Tyroxin volný index:Hmotnostní koncentrace:Časový bod:Sérum/plazma:Kvantitativní:Vypočteno
el-GRGreek (Greece)Δείκτης ελεύθερης θυροξίνης:MCnc:Pt:Ορός/Πλάσμα:Qn:Υπολογιζόμενο
Synonyms: CHEM MCnc Pt Qn Δείκτης ελεύθερης θυροξίνης Θυροξίνη Θυροξίνη.ελεύθερη Ορός Ορός/Πλάσμα Πλάσμα Υπολογιζόμενο
es-ARSpanish (Argentina)índice de tiroxina libre:concentración arbitraria:punto en el tiempo:suero/plasma:cuantitativo:
es-ESSpanish (Spain)Índice de tiroxina libre:Concentración de masa:Punto temporal:Suero o Plasma:Qn:Calculado
Synonyms: Cuantitativo
es-MXSpanish (Mexico)Índice libre de tiroxina:Concentración de masa:Punto temporal:Suero o Plasma:Cuantitativo:Calculado
fr-CAFrench (Canada)Indice de thyroxine libre:Concentration de masse:Temps ponctuel:Sérum/Plasma:Quantitatif:Calculé
fr-FRFrench (France)Thyroxine libre Index:Masse/Volume:Ponctuel:Sérum/Plasma:Numérique:Résultat calculé
fr-BEFrench (Belgium)Indice de thyroxine libre:Concentration de masse:Temps ponctuel:Sérum/Plasma:Quantitatif:Calculé
Synonyms: IT4L T4 T4L,fT4
it-ITItalian (Italy)Tiroxina libera, indice:MCnc:Pt:Siero/Plasma:Qn:Calcolato
Synonyms: Chimica Concentrazione di Massa Indice di tiroxina libera Plasma Punto nel tempo (episodio) Siero Siero o Plasma Tiroxina libera
ko-KRKorean (Korea, Republic Of)티록신 유리 지수:임의농도:검사시점:혈청/혈장:정량:
nl-NLDutch (Netherlands)thyroxine vrij index:massa/volume:moment:serum of plasma:kwantitatief:berekend
pl-PLPolish (Poland)Wolna tyroksyna, indeks:stężenie masowe:punkt w czasie:surowica lub osocze:ilościowy:obliczony
pt-BRPortuguese (Brazil)Indice de Tiroxina.Livre:ACnc:Pt:Sor/Plas:Qn:
Synonyms: ; FTI; FT4I; T7; T4 Free; T-4; FreeT4; Thyrox; Thyrx; Thyroxin; Levothyroxine; Levo-thyroxine; L-thyroxine; Arbitrary concentration; Point in time; Random; SerPl; SerPlas; SerP; Serum; SR; Plasma; Pl; Plsm; Quantitative; QNT; Quant; Quan; FT4; FR; Non-protein bound; Chemistry
ru-RURussian (Russian Federation)Тироксин свободный индекс:МассКонц:ТчкВрм:Сыв/Плаз:Колич:Вычисленный
Synonyms: Количественный Массовая концентрация Плазма Сыворотка Сыворотка или Плазма Точка во времени;Момент
tr-TRTurkish (Turkey)Tiroksin serb indeksi:KütlKons:Zmlı:Ser/Plaz:Kant:Hesaplanmış
zh-CNChinese (China)游离型甲状腺素指数:质量浓度:时间点:血清/血浆:定量型:计算法
Synonyms: FT4 FT4;FT-4;T4.游离;T4.游离型;游离 T4;游离型 T4;游离型甲状腺素;游离甲状腺素;甲状腺素.游离 FT4I;FTI;T7;游离型甲状腺素指数（Free Thyroxine Index，FTI）;甲状腺素游离指数 T4;T-4;四碘甲状腺原氨酸;四碘甲腺原氨酸;左旋四碘甲状腺原氨酸;左旋四碘甲腺原氨酸;左旋甲状腺氨酸;左旋甲状腺素;左旋甲状腺素（Levothyroxine，Levo-thyroxine，L-thyroxine）;甲状腺氨酸 化学;化学检验项目;化学检验项目类;化学类;化学试验;非刺激耐受型化学检验项目;非刺激耐受型化学检验项目类;非刺激耐受型化学试验;非刺激耐受型化学试验类 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 时刻;随机;随意;瞬间 水平;浓度;质量浓度(单位体积) 游离 游离T4 游离四碘甲状腺原氨酸 游离型四碘甲状腺原氨酸 游离甲状腺素 血清或血浆 计算;计算型方法 非蛋白结合型 非蛋白质结合型

Example Units

UnitSource
{Index_val}Example UCUM Units

LOINC Terminology Service (API) using HL7® FHIR® Get Info

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=32215-6