LOINC
Version 2.73

33174-4Fetal Head Circumference estimated from gestational age by method of Chitty 1994 (US)Active

Part Description

LP70910-2   Perimeter
Perimeter is the measurement of any boundary. Measurements of the area and perimeter of fetal cross-sections have been found to establish both an accurate estimation of birthweight and an early diagnosis and differentiation of the various types of abnormal fetal growth patterns. For example, abdominal perimeter measurements are an effective predictor of discordant twins where the weight difference between the two exceeds 15%.
[PMID:103914] [PMID:3309749] Source: Regenstrief LOINC

Fully-Specified Name

Component
Perimeter
Property
Len
Time
Pt
System
Head^Fetus
Scale
Qn
Method
US.estimated from Chitty 1994

Additional Names

Short Name
Fet Head Circum from GA.Chitty94

Basic Attributes

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

Formula (Readable)

Head Circumference from gestational age: HC = -109.9 +15.16* MA- 0.002388*MA3; SD = 3.644+0.2311*MA; Limits: 12-42 weeks; HC (mm) from 59-368

Reference Information

Type Source Reference
Article NCBI PubMed Chitty LS, Altman DG, Henderson A, Campbell S. Charts of fetal size: 2. Head measurements. Br J Obstet Gynaecol. 1994 Jan;101(1):35-43. Link to PubMed

Language Variants Get Info

zh-CNChinese (China)
周长:长度:时间点:头部^胎儿:定量型:超声.依据Chitty的胎龄估计法.94
it-ITItalian (Italy)
Perimetro:Len:Pt:Testa^feto:Qn:Ecografia.stimata da Chitty 1994
pt-BRPortuguese (Brazil)
Perímetro:Comprimento:Pt:Crânio^feto:Qn:US.estimado pela tAcela de Chitty.94
es-ARSpanish (Argentina)
US.ESTIMATED FROM CHITTY.94:longitud:punto en el tiempo:cabeza^feto:cuantitativo:US.ESTIMATED FROM CHITTY.94
es-MXSpanish (Mexico)
Perímetro:Len:Punto temporal:Cabeza ^ feto:Cuantitativo:US.estimated from Chitty 1994

Example Units

Unit Source
mm Example UCUM Units

LOINC FHIR® API Example - CodeSystem Request Get Info

https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=33174-4