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Pregnancy—estimated duration (at the first visit for antenatal care), completed weeks N[N]

Identifying and definitional attributes

Metadata item type:Help on this termData Element
Short name:Help on this termPregnancy duration at the first antenatal care visit
Synonymous names:Help on this termEstimated pregnancy gestation in completed weeks at the first visit for antenatal care.
METeOR identifier:Help on this term673258
Registration status:Help on this termHealth, Superseded 12/12/2018
Indigenous, Archived 02/04/2019
ACT Health, Final 14/08/2018
Definition:Help on this term

The estimated duration of a pregnancy in total completed weeks, on the day of the first visit for antenatal care.

Data element concept attributes

Identifying and definitional attributes

Data element concept:Pregnancy—estimated duration
Synonymous names:Help on this termPregnancy—estimated gestation
METeOR identifier:Help on this term379595
Registration status:Help on this termHealth, Superseded 12/12/2018
Tasmanian Health, Archived 03/07/2020
WA Health, Endorsed 04/03/2014
Indigenous, Archived 02/04/2019
ACT Health, Final 14/08/2018
Definition:Help on this term

The estimated duration of a pregnancy on a specified day.

Object class:Help on this termPregnancy
Property:Help on this termEstimated duration

Collection and usage attributes

Guide for use:Help on this term

The duration of a pregnancy on the day of the first antenatal visit has the same value as the best estimate of gestational age for the fetus or baby. 
There may be one or more revisions of pregnancy duration after the first antenatal visit if a better estimate of gestational age of the fetus or baby becomes available. Revised estimates are not usually applied retrospectively in health records. The best estimate of pregnancy duration is used to record the gestation at later antenatal visits and to assign gestational age to the baby recorded at the time of birth.

If gestational age has been revised, a similar revision will need to be applied to earlier recorded estimates of pregnancy duration. Alternatively the pregnancy duration on a specified day can be calculated from the gestational age on the day of the baby at birth.

Value domain attributes

Identifying and definitional attributes

Value domain:Total weeks N[N]
METeOR identifier:Help on this term308220
Registration status:Help on this termHealth, Standard 02/12/2009
Tasmanian Health, Endorsed 20/12/2016
Indigenous, Endorsed 16/09/2014
ACT Health, Final 14/08/2018
Definition:Help on this termTotal number of completed weeks.

Representational attributes

Representation class:Help on this termTotal
Data type:Help on this termNumber
Format:Help on this termN[N]
Maximum character length:Help on this term2
Supplementary values:Help on this term
ValueMeaning
99Not stated/unknown
Unit of measure:Help on this termCompleted weeks

Data element attributes

Collection and usage attributes

Guide for use:Help on this term

The day of the first visit for antenatal care is the day of the first contact with a midwife, medical practitioner, or other recognised health professional where antenatal care was provided. It does not include a visit where the sole purpose of contact is to confirm the pregnancy, or those contacts that occurred during the pregnancy that related solely to non-pregnancy related issues. It does not include a first contact after the onset of labour.

Antenatal care visits are attributed to the pregnant woman. The duration of the pregnancy on that day is the same as the gestational age of the fetus or baby on that day.

Collection methods:Help on this term

To be collected at any time during the pregnancy or birth episode after the best estimate of gestational age has been determined.

The method of data collection will usually be from health records of pregnancy and/or birth.

The valid range of completed weeks for pregnancy duration at the first visit for antenatal care is 3–46.

Source and reference attributes

Submitting organisation:Help on this term

National Perinatal Data Development Committee

Relational attributes

Related metadata references:Help on this term

Supersedes Pregnancy—estimated duration (at the first visit for antenatal care), completed weeks N[N] Health, Superseded 02/08/2017, Tasmanian Health, Archived 03/07/2020, Indigenous, Archived 22/10/2018

Has been superseded by Pregnancy—estimated duration of pregnancy at the first antenatal care visit, total completed weeks N[N] Health, Standard 12/12/2018, Tasmanian Health, Endorsed 03/07/2020, Indigenous, Endorsed 02/04/2019

See also Product of conception—gestational age, completed weeks N[N] Health, Superseded 12/12/2018, ACT Health, Final 14/08/2018

Implementation in Data Set Specifications:Help on this term
All attributes +

Indigenous primary health care NBEDS 2018–19 Health, Superseded 12/12/2018
Indigenous, Archived 02/04/2019

DSS specific attributes +

Perinatal NMDS 2018-19 Health, Superseded 12/12/2018
ACT Health, Final 14/08/2018

DSS specific attributes +
Implementation in Indicators:Help on this termUsed as numerator
Indigenous primary health care: PI13a-Number of regular clients who had their first antenatal care visit within specified periods, 2018-2019 Health, Superseded 16/01/2020
Indigenous, Endorsed 17/10/2018
Indigenous primary health care: PI13b-Proportion of regular clients who had their first antenatal care visit within specified periods, 2018-2019 Health, Superseded 16/01/2020
Indigenous, Endorsed 17/10/2018
National Core Maternity Indicators: PI 02–Antenatal care visits in the first trimester for all females giving birth, 2020 Health, Standardisation pending 06/08/2020
Used as denominator
National Core Maternity Indicators: PI 02–Antenatal care visits in the first trimester for all females giving birth, 2020 Health, Standardisation pending 06/08/2020
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