Product of conception—gestational age, total completed weeks N[N]

Identifying and definitional attributes
Metadata item type:	Data Element
Short name:	Gestational age
METEOR identifier:	695332
Registration status:	Health, Standard 12/12/2018 Tasmanian Health, Standard 03/07/2020
Definition:	The gestational age of a product of conception in completed weeks.

Data element concept attributes

Identifying and definitional attributes

Data element concept:

Product of conception—gestational age

METEOR identifier:

695405

Registration status:

Health, Standard 12/12/2018
Tasmanian Health, Standard 03/07/2020

Definition:

The gestational age of a product of conception.

Context:

Perinatal

Object class:

Product of conception

Property:

Gestational age

Value domain attributes

Identifying and definitional attributes

Value domain:

Total weeks N[N]

METEOR identifier:

308220

Registration status:

ACT Health (retired), Candidate 14/08/2018
Health, Standard 02/12/2009
Indigenous, Standard 16/09/2014
Tasmanian Health, Standard 20/12/2016

Definition:

Total number of completed weeks.

Representational attributes

Representation class:

Total

Data type:

Number

Format:

N[N]

Maximum character length:

Supplementary values:

Value	Meaning
99	Not stated/unknown

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 (LMP), 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 LMP, 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:

pre-term: less than 37 completed weeks (less than 259 days) of gestation
term: from 37 completed weeks to less than 42 completed weeks (259 to 293 days) of gestation
post-term: 42 completed weeks or more (294 days or more) of gestation.

Comments:

Gestational age is a key marker in pregnancy and an important risk factor for neonatal outcomes.