Product of conception—gestational age, completed weeks N[N]
Identifying and definitional attributes
|Metadata item type:||Data Element|
|Short name:||Gestational age|
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 duration of gestation can be determined from the first day of the last normal menstrual period, from ultrasound or clinical assessment. For the purpose of the national collection, gestational age is expressed in completed weeks.
The World Health Organization identifies the following categories:
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
International Classification of Diseases and Related Health Problems, 10 Revision, WHO, 1992
American Academy of Pediatrics 2004. Policy statement Age terminology during the perinatal period. Paediatrics 114:5 November.
|Related metadata references:|
Supersedes Female (pregnant)—estimated gestational age, total weeks NN
See also Pregnancy—estimated duration (at the first visit for antenatal care), completed weeks N[N]
Has been superseded by Product of conception—gestational age, completed weeks N[N]
|Implementation in Data Set Specifications:|
All attributes +
|Implementation in Indicators:|
The download may take a while, please wait.
Do not refresh the screen until the download is complete.