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Pregnancy—estimated duration of pregnancy at the first antenatal care visit, total 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 gestational age in completed weeks at first antenatal care visit
METeOR identifier:Help on this term695410
Registration status:Help on this termHealth, Standard 12/12/2018
Tasmanian Health, Endorsed 03/07/2020
Indigenous, Endorsed 02/04/2019
Definition:Help on this term

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

Data Element Concept:Pregnancy—estimated duration of pregnancy at the first antenatal care visit

Value domain attributes

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 antenatal care visit is the day of the first contact with a midwife, clinician, 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 female. The duration of a pregnancy on the day of the first antenatal care visit is the same as the best estimate of gestational age of the fetus or baby.

There may be one or more revisions of pregnancy duration after the first antenatal care visit if a better estimate of gestational age of the fetus or baby becomes available. Revised estimates are not usually applied retrospectively in antenatal records. The best estimate of pregnancy duration is used to record the gestation at later antenatal care 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 of the baby at birth.

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 antenatal care visit is 3 to 46 weeks.

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 12/12/2018, Indigenous, Archived 02/04/2019, ACT Health, Final 14/08/2018

See also Product of conception—gestational age, total completed weeks N[N] Health, Standard 12/12/2018, Tasmanian Health, Endorsed 03/07/2020

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

Indigenous primary health care NBEDS 2019–20 Health, Superseded 16/01/2020
Indigenous, Endorsed 02/04/2019

DSS specific attributes +

Indigenous primary health care NBEDS 2020–21 Health, Standard 16/01/2020

DSS specific attributes +

Perinatal NMDS 2019–20 Health, Standard 12/12/2018

DSS specific attributes +

Perinatal NMDS 2020–21 Health, Standard 20/11/2019

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, 2020–2021 Health, Standard 16/01/2020
Indigenous, Final 08/08/2019
Indigenous primary health care: PI13b-Proportion of regular clients who had their first antenatal care visit within specified periods, 2020–2021 Health, Standard 16/01/2020
Indigenous, Final 08/08/2019
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