Identifying and definitional attributes | |
Metadata item type: | Data Element |
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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 |
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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] |
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METEOR identifier: | 308220 |
Registration status: | 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 | |
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Data type: | Number | |
Format: | N[N] | |
Maximum character length: | 2 | |
Value | Meaning | |
Supplementary values: | 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:
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Comments: | Gestational age is a key marker in pregnancy and an important risk factor for neonatal outcomes. | ||||||||||||||||
Source and reference attributes | |||||||||||||||||
Submitting organisation: | National Perinatal Data Development Committee | ||||||||||||||||
Origin: | WHO (World Health Organization) 1992. International Classification of Diseases and Related Health Problems, 10th Revision. Geneva: WHO. | ||||||||||||||||
Reference documents: | American Academy of Pediatrics 2004. Policy statement: Age terminology during the perinatal period. Paediatrics 114(5):1362–64. | ||||||||||||||||
Relational attributes | |||||||||||||||||
Related metadata references: | Supersedes Product of conception—gestational age, completed weeks N[N] Health!, Superseded 12/12/2018 See also Pregnancy—estimated duration of pregnancy at the first antenatal care visit, total completed weeks N[N] Health!, Standard 03/12/2020 Indigenous, Standard 14/07/2021 See also 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, Standard 03/07/2020 | ||||||||||||||||
Implementation in Data Set Specifications: | Perinatal NMDS 2019–20 Health!, Superseded 03/12/2020 Implementation start date: 01/07/2019 Implementation end date: 30/06/2020 DSS specific information: The first day of the last menstrual period (LMP) is required to estimate gestational age, which is a key marker in pregnancy and an important risk factor for neonatal outcomes. Although the date of the LMP may not be known, or may sometimes be erroneous, estimation of gestational age based on clinical assessment may also be inaccurate. Gestational age is usually estimated based on available information on LMP and clinical assessment. In the case of multiple births, this data element should be recorded for each baby born. 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:
Perinatal NMDS 2020–21 Health!, Superseded 03/12/2020 Implementation start date: 01/07/2020 Implementation end date: 30/06/2021 DSS specific information: The first day of the last menstrual period (LMP) is required to estimate gestational age, which is a key marker in pregnancy and an important risk factor for neonatal outcomes. Although the date of the LMP may not be known, or may sometimes be erroneous, estimation of gestational age based on clinical assessment may also be inaccurate. Gestational age is usually estimated based on available information on LMP and clinical assessment. In the case of multiple births, this data element should be recorded for each baby born. The following code has been agreed by the National Perinatal Data Development Committee (NPDDC) as a supplementary code for use in the Perinatal NMDS:
Perinatal NMDS 2021–22 Health!, Superseded 17/12/2021 Implementation start date: 01/07/2021 Implementation end date: 30/06/2022 DSS specific information: The first day of the last menstrual period (LMP) is required to estimate gestational age, which is a key marker in pregnancy and an important risk factor for neonatal outcomes. Although the date of the LMP may not be known, or may sometimes be erroneous, estimation of gestational age based on clinical assessment may also be inaccurate. Gestational age is usually estimated based on available information on LMP and clinical assessment. In the case of multiple births, this data element should be recorded for each baby born. The following code has been agreed by the National Perinatal Data Development Committee (NPDDC) as a supplementary code for use in the Perinatal NMDS:
Perinatal NMDS 2022–23 Health!, Standard 17/12/2021 Implementation start date: 01/07/2022 Implementation end date: 30/06/2023 DSS specific information: The first day of the last menstrual period (LMP) is required to estimate gestational age, which is a key marker in pregnancy and an important risk factor for neonatal outcomes. Although the date of the LMP may not be known, or may sometimes be erroneous, estimation of gestational age based on clinical assessment may also be inaccurate. Gestational age is usually estimated based on available information on LMP and clinical assessment. In the case of multiple births, this data element should be recorded for each baby born. The following code has been agreed by the National Perinatal Data Development Committee (NPDDC) as a supplementary code for use in the Perinatal NMDS:
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Implementation in Indicators: | National Core Maternity Indicators: PI 04–Apgar score of less than 7 at 5 minutes for births at or after term, 2021 Health!, Standard 17/12/2021 National Core Maternity Indicators: PI 05–Induction of labour for selected females giving birth for the first time, 2021 Health!, Standard 17/12/2021 National Core Maternity Indicators: PI 06–Caesarean section for selected females giving birth for the first time, 2021 Health!, Standard 17/12/2021 National Core Maternity Indicators: PI 07–Non-instrumental vaginal birth for selected females giving birth for the first time, 2021 Health!, Standard 17/12/2021 National Core Maternity Indicators: PI 08–Instrumental vaginal birth for selected females giving birth for the first time, 2021 Health!, Standard 17/12/2021 National Core Maternity Indicators: PI 10–Small babies among births at or after 40 weeks gestation, 2021 Health!, Standard 17/12/2021 National Healthcare Agreement: PI 01–Proportion of babies born of low birth weight, 2022 Health!, Standard 24/09/2021 National Core Maternity Indicators: PI 04–Apgar score of less than 7 at 5 minutes for births at or after term, 2021 Health!, Standard 17/12/2021 National Core Maternity Indicators: PI 05–Induction of labour for selected females giving birth for the first time, 2021 Health!, Standard 17/12/2021 National Core Maternity Indicators: PI 06–Caesarean section for selected females giving birth for the first time, 2021 Health!, Standard 17/12/2021 National Core Maternity Indicators: PI 07–Non-instrumental vaginal birth for selected females giving birth for the first time, 2021 Health!, Standard 17/12/2021 National Core Maternity Indicators: PI 08–Instrumental vaginal birth for selected females giving birth for the first time, 2021 Health!, Standard 17/12/2021 |