LOINC
Version 2.71

33123-1Gestational age estimated from Inter ocular distance on US by Trout 1994 methodActive

Part Description

LP19507-0   Gestational age
The age of the conceptus, beginning from the time of fertilization. In clinical obstetrics, the gestational age is often estimated as the time from the last day of the last menstruation which is about 2 weeks before ovulation and fertilization. Source: National Library of Medicine, MeSH 2006

Fully-Specified Name

Component
Gestational age
Property
Time
Time
Pt
System
^Fetus
Scale
Qn
Method
US+Estimated from IOD.Trout 1994

Additional Names

Short Name
GA from IOD.Trout94

Basic Attributes

Class
OB.US
Type
Clinical
First Released
Version 2.09
Last Updated
Version 2.70
Order vs. Observation
Observation

Formula (Readable)

Gestational age from Inter Orbital Diameter diameter: IOD (mm) = - 4.14 + 0.94 (GA) - 0.007 (GA2) GA is in weeks

Reference Information

Type Source Reference
Article NCBI PubMed Trout T, Budorick NE, Pretorius DH, McGahan JP. Significance of orbital measurements in the fetus. J Ultrasound Med. 1994 Dec;13(12):937-43. Link to PubMed

Member of these Groups

LG50112-8 Gestational ageTime^Fetus

Language Variants Get Info

zh-CNChinese (China)
孕龄:时间:时间点:^胎儿:定量型:超声+依据眼眶内距的估计法.Trout.94
fr-BEFrench (Belgium)
Age gestationnel:Durée:Temps ponctuel:^Foetus:Quantitatif:US.estimé selon IOD.Trout 1994
it-ITItalian (Italy)
Età gestazionale:Tempo:Pt:^feto:Qn:Ecografia.stimata da IOD.Trout 1994
pt-BRPortuguese (Brazil)
Idade gestacional:Tempo:Pt:^Feto:Qn:US.estimado pelo diâmetro interorbital interno.Trout.94
es-ARSpanish (Argentina)
US.ESTIMATED FROM IOD.TROUT.94:tiempo:punto en el tiempo:^feto:cuantitativo:US.ESTIMATED FROM IOD.TROUT.94

Example Units

Unit Source
d Example UCUM Units

LOINC FHIR® API Example - CodeSystem Request Get Info

https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=33123-1