Version 2.77

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
Bld.dot
Scale
Qn
Method

Additional Names

Short Name
T4 Free DBS-mCnc
Display Name
Free T4 (DBS) [Mass/Vol]
Consumer Name Alpha Get Info
Free T4, Dried blood spot

Basic Attributes

Class
CHEM
Type
Laboratory
First Released
Version 2.24
Last Updated
Version 2.73
Order vs. Observation
Both
Common Test Rank Get Info
11980

Member of these Groups Get Info

LOINC Group Group Name
LG49673-3 Thyroxine.free|Pt|Bld.dot

Language Variants Get Info

Tag Language Translation
de-DE German (Germany) Thyroxin.frei:Massenkonzentration:Zeitpunkt:Blut.Tropfen:Quantitativ:
Synonyms: fT4
es-ES Spanish (Spain) Tiroxina libre:Concentración de masa:Punto temporal:gota de sangre (papel de filtro):Qn:
Synonyms: Cuantitativo
es-MX Spanish (Mexico) Thyroxine.libre:Concentración de masa:Punto temporal:DBS:Cuantitativo:
et-EE Estonian (Estonia) Türoksiin.vaba:MCnc:Pt:Vereplekk:Qn:
Synonyms: Juhuslik Kvantitatiivne Veri
fr-CA French (Canada) Thyroxine.libre:Concentration de masse:Temps ponctuel:Sang sur papier filtre:Quantitatif:
fr-FR French (France) Thyroxine libre:Masse/Volume:Ponctuel:Sang buvard:Numérique:
fr-BE French (Belgium) Thyroxine.libre:Concentration de masse:Temps ponctuel:Sang sur papier filtre:Quantitatif:
Synonyms: T4 T4L,fT4
it-IT Italian (Italy) Tiroxina.libera:MCnc:Pt:Sangue.su carta da filtro:Qn:
Synonyms: Chimica Concentrazione di Massa Punto nel tempo (episodio) Sangue Spot sangue secco Tiroxina libera
nl-NL Dutch (Netherlands) thyroxine.vrij:massa/volume:moment:gedroogde bloedspot:kwantitatief:
pl-PL Polish (Poland) Wolna tyroksyna:stężenie masowe:punkt w czasie:sucha kropla krwi:ilościowy:
pt-BR Portuguese (Brazil) Tiroxina.livre:MCnc:Pt:SgPapel:Qn:
Synonyms: ; T4 Free; T-4; FreeT4; Thyrox; Thyrx; Thyroxin; Levothyroxine; Levo-thyroxine; L-thyroxine; Mass concentration; Level; Point in time; Random; DBS; Filter paper; FP; Dried blood spot; Blood; WB; Whole blood; Quantitative; QNT; Quant; Quan; FT4; FR; Non-protein bound; Chemistry
ru-RU Russian (Russian Federation) Тироксин.свободный:МассКонц:ТчкВрм:Кр.Сух.капл:Колич:
Synonyms: Количественный Кровь Кровь сухая капля Массовая концентрация Точка во времени;Момент
tr-TR Turkish (Turkey) Tiroksin.serb:KütlKons:Zmlı:Kan.nokta:Kant:
zh-CN Chinese (China) 甲状腺素.游离型:质量浓度:时间点:全血.斑点: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 全血斑点(滤纸);滤纸;血液.斑点;血液斑点(滤纸) 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;血液 非蛋白结合型 非蛋白质结合型

Example Units

Unit Source
ng/dL 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=53349-7