Version 2.74

Term Description

This term was created for, but is not limited in use to, bioMerieux's VIDAS FT4 assay, which is intended for the quantitative detection of free thyroxine (FT4) in human serum or plasma.
Source: Regenstrief LOINC

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
MCnc
Time
Pt
System
Ser/Plas
Scale
Qn
Method
IA

Additional Names

Short Name
T4 Free SerPl IA-mCnc
Display Name
Free T4 IA [Mass/Vol]
Consumer Name Alpha
Free T4, Blood

Basic Attributes

Class
CHEM
Type
Laboratory
First Released
Version 2.58
Last Updated
Version 2.58
Order vs. Observation
Both

Member of these Groups

LOINC Group Group Name
LG12004-4 Thyroxine.free|MCnc|Pt|ANYBldSerPl
LG49676-6 Thyroxine.free|Pt|Ser/Plas|IA

Language Variants

Tag Language Translation
zh-CN Chinese (China) 甲状腺素.游离型:质量浓度:时间点:血清/血浆:定量型:免疫测定法
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 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 免疫测定;免疫分析法;免疫检定法;免疫检定;免疫试验;酶免疫测定法;酶免疫测定;酶免疫分析法;酶免疫检定法;酶免疫检定;酶免疫试验 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 非蛋白结合型 非蛋白质结合型
fr-CA French (Canada) Thyroxine.libre:Concentration de masse:Temps ponctuel:Sérum/Plasma:Quantitatif:IA
et-EE Estonian (Estonia) Türoksiin.vaba:MCnc:Pt:S/P:Qn:IA
Synonyms: Juhuslik Kvantitatiivne Plasma Seerum Seerum või plasma
es-ES Spanish (Spain) Tiroxina libre:Concentración de masa:Punto temporal:Suero o Plasma:Qn:IA
it-IT Italian (Italy) Tiroxina.libera:MCnc:Pt:Siero/Plasma:Qn:IA
Synonyms: Chimica Concentrazione di Massa Immunoassay Plasma Punto nel tempo (episodio) Siero Siero o Plasma Tiroxina libera
el-GR Greek (Greece) Θυροξίνη ελεύθερη:Συγκέντρωση μάζας:Χρονική στιγμή:Ορός/Πλάσμα:Ποσοτική:IA
Synonyms: Ελεύθερη Τ4 Τ4
fr-FR French (France) Thyroxine libre:Masse/Volume:Ponctuel:Sérum/Plasma:Numérique:Immunoanalyse
tr-TR Turkish (Turkey) Tiroksin.serb:KütlKons:Zmlı:Ser/Plaz:Kant:İA
Synonyms: İmmünölçüm, immünoassay
ru-RU Russian (Russian Federation) Тироксин.свободный:МассКонц:ТчкВрм:Сыв/Плаз:Колич:IA
Synonyms: Количественный Массовая концентрация Плазма Сыворотка Сыворотка или Плазма Точка во времени;Момент
nl-NL Dutch (Netherlands) thyroxine.vrij:massa/volume:moment:serum of plasma:kwantitatief:immunoassay
Synonyms: IA
fr-BE French (Belgium) Thyroxine.libre:Concentration de masse:Temps ponctuel:Sérum/Plasma:Quantitatif:IA
Synonyms: T4 T4L,fT4
pl-PL Polish (Poland) wolna tyroksyna:Stężenie masowe:Punkt w czasie:Surowica lub osocze:ilościowy:metoda immunochemiczna
Synonyms: osocze test immunologiczny; IA
de-DE German (Germany) Thyroxin.frei:Massenkonzentration:Zeitpunkt:Serum oder Plasma:Quantitativ:Immunoassay
Synonyms: fT4
es-MX Spanish (Mexico) Thyroxine.libre:Concentración de masa:Punto temporal:Suero o Plasma:Cuantitativo:Inmunoensayo

Example Units

Unit Source
pg/mL Example UCUM Units

LOINC Terminology Service (API) using HL7® FHIR®

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=83122-2