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Updated: Oct 13, 2025

Murine Fetal Echocardiography
Published on: February 15, 2013
Guidelines for the performance of the first trimester ultrasound
Karen Mizia1,2,3, Sue Campbell Westerway1,4, Meiri Robertson5
1Australasian Society for Ultrasound in Medicine (ASUM) Sydney New South Wales Australia.
Abstract:
The purpose of this document is to guide ultrasound practitioners in providing accurate information on the assessment of gestational age, viability and fetal development in the first trimester. In the presence of twins and higher order multiple pregnancies, it is also intended to assess chorionicity and amnionicity which have implications for risk assessment and continuing antenatal care. This guideline has been adopted by the ASUM Council and is applicable to all ultrasound practitioners.
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