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Pregnancy—estimated duration of pregnancy at the first antenatal care visit, total completed weeks N[N]

Data Element Attributes

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 term732908
Registration status:Help on this term
  • Health, Standard 03/12/2020
  • Indigenous, Standard 14/07/2021
  • Tasmanian Health, Standard 24/03/2023
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:Help on this termPregnancy—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 of pregnancy at the first antenatal care visit, total completed weeks N[N]
  • Health, Superseded 03/12/2020
  • Indigenous, Superseded 14/07/2021
  • Tasmanian Health, Superseded 24/03/2023
See also Product of conception—gestational age, total completed weeks N[N]
  • Health, Standard 12/12/2018
  • Tasmanian Health, Standard 03/07/2020
Implementation in Data Set Specifications:Help on this term
All attributes +
Indigenous-specific primary health care NBEDS December 2020
Indigenous, Superseded 03/07/2022
DSS specific attributes +
Implementation start date: 01/07/2020
Implementation end date: 31/12/2020
Conditional obligation:

Reporting against this data element is conditional on a 'CODE 2 Female' response to 'Person—sex, code X'.

Data are only provided to the AIHW for females who gave birth during the 12 months up to the census date.

Data are provided to the AIHW relating to live births, and still births if the birthweight was at least 400 grams or the gestational age was 20 weeks or more.


Indigenous-specific primary health care NBEDS December 2021
Indigenous, Standard 06/11/2022
DSS specific attributes +
Implementation start date: 01/07/2021
Implementation end date: 31/12/2021
Conditional obligation:

Reporting against this data element is conditional on a 'CODE 2 Female' response to 'Person—sex, code X'.

Data are only provided to the AIHW for females who gave birth during the 12 months up to the census date.

Data are provided to the AIHW relating to live births, and still births if the birthweight was at least 400 grams or the gestational age was 20 weeks or more.


Indigenous-specific primary health care NBEDS June 2021
Indigenous, Superseded 06/11/2022
DSS specific attributes +
Implementation start date: 01/01/2021
Implementation end date: 30/06/2021
Conditional obligation:

Reporting against this data element is conditional on a 'CODE 2 Female' response to 'Person—sex, code X'.

Data are only provided to the AIHW for females who gave birth during the 12 months up to the census date.

Data are provided to the AIHW relating to live births, and still births if the birthweight was at least 400 grams or the gestational age was 20 weeks or more.


Perinatal NMDS 2021–22
Health, Superseded 17/12/2021
DSS specific attributes +
Implementation start date: 01/07/2021
Implementation end date: 30/06/2022
DSS specific information:

This data element is recorded for the mother only.

The following code has been agreed by the National Perinatal Data Development Committee (NPDDC) as a supplementary code for use in the Perinatal NMDS:

ValueMeaning
99Not stated/inadequately described

Perinatal NMDS 2022–23
Health, Superseded 09/12/2022
DSS specific attributes +
Implementation start date: 01/07/2022
Implementation end date: 30/06/2023
DSS specific information:

This data element is recorded for the mother only.

The following code has been agreed by the National Perinatal Data Development Committee (NPDDC) as a supplementary code for use in the Perinatal NMDS:

ValueMeaning
99Not stated/inadequately described

Perinatal NMDS 2023–24
Health, Standard 09/12/2022
DSS specific attributes +
Implementation start date: 01/07/2023
Implementation end date: 30/06/2024
DSS specific information:

This data element is recorded for the mother only.

The following code has been agreed by the National Perinatal Data Development Committee (NPDDC) as a supplementary code for use in the Perinatal NMDS:

ValueMeaning
99Not stated/inadequately described

Implementation in Indicators:Help on this term
Used as Numerator
Indigenous-specific primary health care: PI13a-Number of female Indigenous regular clients who gave birth within the previous 12 months, and who have their first antenatal care visit within a specified period, December 2021
  • Indigenous, Standard 06/11/2022
Indigenous-specific primary health care: PI13a-Number of female Indigenous regular clients who gave birth within the previous 12 months, and who have their first antenatal care visit within a specified period, June 2021
  • Indigenous, Superseded 06/11/2022
Indigenous-specific primary health care: PI13a-Number of Indigenous regular clients who have their first antenatal care visit within specified periods, December 2020
  • Indigenous, Superseded 03/07/2022
Indigenous-specific primary health care: PI13b-Proportion of female Indigenous regular clients who gave birth within the previous 12 months, and who have their first antenatal care visit within a specified period, December 2021
  • Indigenous, Standard 06/11/2022
Indigenous-specific primary health care: PI13b-Proportion of female Indigenous regular clients who gave birth within the previous 12 months, and who have their first antenatal care visit within a specified period, June 2021
  • Indigenous, Superseded 06/11/2022
Indigenous-specific primary health care: PI13b-Proportion of Indigenous regular clients who have their first antenatal care visit within specified periods, December 2020
  • Indigenous, Superseded 03/07/2022
National Core Maternity Indicators: PI 02–Antenatal care visits in the first trimester for all females giving birth, 2023
  • Health, Qualified 10/03/2023
Used as Denominator
National Core Maternity Indicators: PI 02–Antenatal care visits in the first trimester for all females giving birth, 2023
  • Health, Qualified 10/03/2023
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