LOINC
Version 2.71

33098-5Gestational age estimated from Femur length on US by Chitty 1997 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 FL.Chitty 1997

Additional Names

Short Name
GA from FL.Chitty 1997

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 Femur Length: GA = Exp (0.034375*FL-0.0037254*Fl*loge (Fl)+2.306); SD: ± 0.00025215*Fl+0.03165; Derived output: 12-39 weeks; Published input: 10-67 mm

Reference Information

Type Source Reference
Article NCBI PubMed Altman DG, Chitty LS. New charts for ultrasound dating of pregnancy. Ultrasound Obstet Gynecol. 1997 Sep;10(3):174-91. 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+依据股骨长度的估计法.Chitty.97
fr-BEFrench (Belgium)
Age gestationnel:Durée:Temps ponctuel:^Foetus:Quantitatif:US.estimé selon FL.Chitty 1997
it-ITItalian (Italy)
Età gestazionale:Tempo:Pt:^feto:Qn:Ecografia.stimata da FL.Chitty 1997
pt-BRPortuguese (Brazil)
Idade gestacional:Tempo:Pt:^Feto:Qn:US.estimado pelo comprimento do fêmur.Chitty.97
es-ARSpanish (Argentina)
US.ESTIMATED FROM FL.CHITTY.97:tiempo:punto en el tiempo:^feto:cuantitativo:US.ESTIMATED FROM FL.CHITTY.97

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=33098-5