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Posted by / 20-Feb-2020 09:07

Selection of the better estimate of the date of birth is based on the following criteria .

The study found a negligible rise in temperature at the ultrasound beam’s focal point.

While a maximum number of additional scans (75,500) and associated costs ($A4.53 million) was estimated, the benefits vary considerably depending on whether a decrease in inductions is assumed, from $A230,000 if only improved power of maternal serum testing is included, to around $A17 million if a decrease in inductions is assumed, with an additional saving of around $A5 million if the link between induction and caesarean section is included.

A range of health professionals may be trained to carry out ultrasounds, including midwives, Aboriginal health workers and GPs.

The date of the first documented positive pregnancy test and the beta-human chorionic gonadotropin (b HCG) level may help ascertain the minimum gestational age.

In women who conceived following assisted reproduction techniques, the date of embryo transfer is known and may date the pregnancy accurately.

Ultrasound examination in the first trimester allows accurate assessment of gestational age, and identifies and allows for appropriate care of women with multiple pregnancies.

This terminology does vary geographically and over time, and it may need clarification if not explicitly defined in relevant articles.

In rare cases, the date of coitus is known, and this may be useful in calculating the length of pregnancy.

For related information, see Medscape's Pregnancy Resource Center.

No studies were identified that assessed psychological harms to the mother, risk of overdiagnosis of placenta praevia or its contribution to anxiety.

An analysis of the cost implications of recommending routine ultrasound for gestational age assessment in the first trimester was undertaken to inform the development of these Guidelines (see separate document on economic analyses).

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The systematic review conducted to inform the development of these Guidelines identified one prospective cohort study (n=8,313) that investigated the best time to conduct gestational age assessment.

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