Product of conception—gestational age, completed weeks N[N]
Identifying and definitional attributes
|Metadata item type:||Data Element|
|Short name:||Gestational age|
|Registration status:||Health, Superseded 12/12/2018|
ACT Health, Final 14/08/2018
The age of a product of conception in completed weeks.
|Data Element Concept:||Product of conception—gestational age|
Value domain attributes
|Maximum character length:||2|
|Unit of measure:||Completed weeks|
Data element attributes
Collection and usage attributes
|Guide for use:|
Gestational age is the best clinical estimate of the duration of pregnancy at a specific point in time, based on the first day of the last menstrual period, ultrasound or physical examination of the baby.
Gestational age is conventionally expressed in completed weeks. When gestational age is calculated using the first day of the last normal menstrual period, the first day is counted as day zero and not day one. Therefore, a 25 week, 5 day fetus is considered a 25 week fetus (25+0, 25+1, 25+2, 25+3, 25+4, 25+5, 25+6).
When ultrasound is used to date a pregnancy, the earliest ultrasound examination should be used and should preferably be between 6 and 10 weeks gestation. Scans performed beyond 24 weeks gestation are unlikely to be reliable in estimating gestational age and should not be used for this purpose.
The World Health Organization identifies the following categories for duration of gestation:
Gestational age is a key marker in pregnancy and an important risk factor for neonatal outcomes.
Source and reference attributes
National Perinatal Data Development Committee
WHO (World Health Organization) 1992. International Classification of Diseases and Related Health Problems, 10th Revision. Geneva: WHO.
American Academy of Pediatrics 2004. Policy statement: Age terminology during the perinatal period. Paediatrics 114(5):1362–64.
|Related metadata references:|
See also Pregnancy—estimated duration (at the first visit for antenatal care), completed weeks N[N] Health, Superseded 12/12/2018, Indigenous, Archived 02/04/2019, ACT Health, Final 14/08/2018
See also Pregnancy—estimated duration, total weeks N[N] WA Health, Endorsed 04/03/2014
Supersedes Product of conception—gestational age, completed weeks N[N] Health, Superseded 02/08/2017, Tasmanian Health, Endorsed 20/12/2016
Has been superseded by Product of conception—gestational age, total completed weeks N[N] Health, Standard 12/12/2018
|Implementation in Data Set Specifications:|
Perinatal NMDS 2018-19 Health, Superseded 12/12/2018
|Implementation in Indicators:||Used as numerator|
Early planned caesarean section without medical or obstetric indication, 2015 Australian Commission on Safety and Quality in Health Care, Standard 13/12/2018