Version 2.78

Term Description

In newborn infants, the reference range for free thyroxine varies with gestational age at time of birth, and is also different in cord blood.
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

Fully-Specified Name

Component
Thyroxine.free
Property
MCnc
Time
Pt
System
BldCo
Scale
Qn
Method

Additional Names

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

Basic Attributes

Class
CHEM
Type
Laboratory
First Released
Version 2.44
Last Updated
Version 2.44
Order vs. Observation
Both

Member of these Groups Get Info

LOINC Group Group Name
LG51283-6 Thyroxine.free|Pt|BldCo

Language Variants Get Info

Tag Language Translation
es-ES Spanish (Spain) Tiroxina libre:Concentración de masa:Punto temporal:Sangre de cordón umbilical:Qn:
Synonyms: Cuantitativo
es-MX Spanish (Mexico) Thyroxine.libre:Concentración de masa:Punto temporal:Cordón de sangre:Cuantitativo:
et-EE Estonian (Estonia) Türoksiin.vaba:MCnc:Pt:uB:Qn:
Synonyms: Juhuslik Kvantitatiivne Nabaväädi veri
fr-CA French (Canada) Thyroxine.libre:Concentration de masse:Temps ponctuel:Sang de cordon:Quantitatif:
fr-FR French (France) Thyroxine libre:Masse/Volume:Ponctuel:Sang de cordon:Numérique:
fr-BE French (Belgium) Thyroxine.libre:Concentration de masse:Temps ponctuel:Sang de cordon:Quantitatif:
Synonyms: T4 T4L,fT4
it-IT Italian (Italy) Tiroxina.libera:MCnc:Pt:Sangue cordone ombelicale:Qn:
Synonyms: Chimica Concentrazione di Massa Punto nel tempo (episodio) Sangue di cordone ombelicale Tiroxina libera
nl-NL Dutch (Netherlands) thyroxine.vrij:massa/volume:moment:navelstrengbloed:kwantitatief:
pl-PL Polish (Poland) Wolna tyroksyna:stężenie masowe:punkt w czasie:krew pępowinowa:ilościowy:
pt-BR Portuguese (Brazil) Tiroxina.livre::Pt:SgCordão:Qn:
ru-RU Russian (Russian Federation) Тироксин.свободный:МассКонц:ТчкВрм:КрП:Колич:
Synonyms: Количественный Кровь пуповинная Массовая концентрация Точка во времени;Момент
tr-TR Turkish (Turkey) Tiroksin.serb:KütlKons:Zmlı:KanKd:Kant:
zh-CN Chinese (China) 甲状腺素.游离型:质量浓度:时间点:脐带全血: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 - 脐带;脐带血;脐带血液;脐血;血液 - 脐带 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 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=73557-1