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Pregnancy—estimated duration

Metadata item type:Help on this termData Element Concept
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Registration status:Help on this termHealth, Superseded 12/12/2018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, Endorsed 20/12/2016
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 attributes

Identifying and definitional attributes

Object class:Pregnancy
Definition:Help on this termThe period during which a woman carries a developing fetus, normally in the uterus. Pregnancy lasts for approximately 266 days, from conception until the baby is born, or 280 days from the first day of the last menstrual period. During pregnancy menstruation is absent, there may be a great increase in appetite, and the breasts increase in size; the woman may also experience morning sickness. These and other changes brought about by a hormone (progesterone) produced at first by the ovary and later by the placenta. Definite evidence of pregnancy is provided by various pregnancy tests, by the detection of the heartbeat of the fetus, and by ultrasound.
Specialisation of:Help on this termLife event

Source and reference attributes

Submitting organisation:Help on this termAustralia Institute of Health and Welfare
Origin:Help on this termUniversity of Oxford 2002. Concise Colour Medical Dictionary 3rd ed. UK: Oxford University Press

Property attributes

Identifying and definitional attributes

Property:Estimated duration
Definition:Help on this termThe period of time during which something continues.
Property group:Help on this termPerformance indicators

Source and reference attributes

Submitting organisation:Help on this termAustralian Institute of Health and Welfare

Data element concept attributes

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.

Relational attributes

Related metadata references:Help on this term

See also Female (pregnant)—estimated gestational age, total weeks NN Health, Superseded 02/12/2009

Has been superseded by Pregnancy—estimated duration of pregnancy at the first antenatal care visit Health, Standard 12/12/2018, Indigenous, Endorsed 02/04/2019

Data Elements implementing this Data Element Concept:Help on this term

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

Pregnancy—estimated duration (at the first visit for antenatal care), completed weeks N[N] Health, Superseded 02/08/2017
Tasmanian Health, Endorsed 20/12/2016
Indigenous, Archived 22/10/2018

Pregnancy—estimated duration, total weeks N[N] WA Health, Endorsed 04/03/2014

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