Version 2.74

Part Description

LP29119-2   Thyroxine.free
Free T4 is the metabolically active fraction of thyroxine and is the precursor of triiodothyronine (T3). Free T4 is a sensitive test for thyroid function and is increased with hyperthyroidism and decreased with hypothyroidism. Free T4 is not affected by changes in thryoxine-binding proteins. Information from Laboratory Test Handbook, Jacobs DS, DeMott WR, and Oxley DK, LexiComp, 2001. Source: Regenstrief Institute

Reference Information

Type Source Reference
Webcontent Lab Tests Online®Copyright Copyright © 2021 Lab Tests Online. All rights reserved. T4, Free

Fully-Specified Name

Component
Thyroxine.free
Property
SCnc
Time
Pt
System
Ser/Plas
Scale
Qn
Method

Additional Names

Short Name
T4 Free SerPl-sCnc
Display Name
Free T4 [Moles/Vol]
Consumer Name Alpha
Free T4, Blood

Basic Attributes

Class
CHEM
Type
Laboratory
First Released
Version 1.0k
Last Updated
Version 2.73
Order vs. Observation
Both
Common Test Rank
8477

Member of these Groups

LOINC Group Group Name
LG49672-5 Thyroxine.free|Pt|Ser/Plas
LG2976-1 Thyroxine.free|SCnc|Pt|ANYBldSerPl

Language Variants

Tag Language Translation
de-DE German (Germany) Thyroxin.frei:Stoffmengenkonzentration:Zeitpunkt:Serum oder Plasma:Quantitativ:
Synonyms: fT4
zh-CN Chinese (China) 甲状腺素.游离型:物质的量浓度:时间点:血清/血浆:定量型:
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 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 克分子浓度;克分子浓度(单位体积);摩尔浓度;摩尔浓度(单位体积);物质的量浓度(单位体积) 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 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 非蛋白结合型 非蛋白质结合型
fr-CA French (Canada) Thyroxine.libre:Concentration de substance:Temps ponctuel:Sérum/Plasma:Quantitatif:
pl-PL Polish (Poland) wolna tyroksyna:Stężenie substancji:Punkt w czasie:Surowica lub osocze:ilościowy:
Synonyms: osocze
es-AR Spanish (Argentina) tiroxina.libre:concentración de sustancia:punto en el tiempo:suero/plasma:cuantitativo:
et-EE Estonian (Estonia) Türoksiin.vaba:SCnc:Pt:S/P:Qn:
Synonyms: Aine kontsentratsioon Juhuslik Kvantitatiivne Plasma Seerum Seerum või plasma
pt-BR Portuguese (Brazil) Tiroxina.livre:SCnc:Pt:Sor/Plas:Qn:
Synonyms: ; T4 Free; T-4; FreeT4; Thyrox; Thyrx; Thyroxin; Levothyroxine; Levo-thyroxine; L-thyroxine; Substance concentration; Level; Point in time; Random; SerPl; SerPlas; SerP; Serum; SR; Plasma; Pl; Plsm; Quantitative; QNT; Quant; Quan; FT4; FR; Non-protein bound; Chemistry
ko-KR Korean (Korea, Republic Of) 유리티록신:물질농도:검사시점:혈청/혈장:정량:
es-ES Spanish (Spain) Tiroxina libre:Concentración de sustancia:Punto temporal:Suero o Plasma:Qn:
it-IT Italian (Italy) Tiroxina.libera:SCnc:Pt:Siero/Plasma:Qn:
Synonyms: Chimica Concentrazione di Sostanza Plasma Punto nel tempo (episodio) Siero Siero o Plasma Tiroxina libera
el-GR Greek (Greece) Θυροξίνη ελεύθερη:Συγκέντρωση ουσίας:Χρονική στιγμή:Ορός/Πλάσμα:Ποσοτική:
Synonyms: Ελεύθερη Τ4 Τ4
fr-FR French (France) Thyroxine libre:Moles/Volume:Ponctuel:Sérum/Plasma:Numérique:
tr-TR Turkish (Turkey) Tiroksin.serb:SubKons:Zmlı:Ser/Plaz:Kant:
ru-RU Russian (Russian Federation) Тироксин.свободный:МолКонц:ТчкВрм:Сыв/Плаз:Колич:
Synonyms: Количественный Молярность;Молярная объёмная концентрация Плазма Сыворотка Сыворотка или Плазма Точка во времени;Момент
nl-NL Dutch (Netherlands) thyroxine.vrij:mol/volume:moment:serum of plasma:kwantitatief:
fr-BE French (Belgium) Thyroxine.libre:Concentration de substance:Temps ponctuel:Sérum/Plasma:Quantitatif:
Synonyms: T4 T4L,fT4
uk-UA Ukraine (Ukrainian) Тироксин.вільний:Молярна Концентрація:МоментЧасу:Сироватка/Плазма:Кількісно:
es-MX Spanish (Mexico) Thyroxine.libre:Concentración de sustancias:Punto temporal:Suero o Plasma:Cuantitativo:

Example Units

Unit Source
pmol/L Example UCUM Units
pmol/L eCHN

LOINC Terminology Service (API) using HL7® FHIR®

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=14920-3