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First Trimester Ultrasound Assessment for Fetal Aneuploidy


Clinical Obstetrics & Gynecology:
doi: 10.1097/GRF.0000000000000013
Noninvasive Screening for Fetal Aneuploidies: Eliminating Unwanted Surprises

Screening tests for trisomy 21 have gradually become more refined and now involve complex statistical models that combine demographic, biophysical, and biochemical parameters to produce individualized risk estimates for pregnant women. An understanding of the evolution of the principles, methods, and statistical techniques applied to Down syndrome screening is valuable as these processes can be transferred to other, more prevalent, adverse pregnancy outcomes. First trimester ultrasound forms the foundation of this process.

Author Information

*RPA Women and Babies, Royal Prince Alfred Hospital

Discipline of Obstetrics, Gynaecology and Neonatology, Faculty of Medicine, University of Sydney, Sydney, New South Wales, Australia

Fetal Medicine Foundation USA

§Division of Maternal Fetal Medicine, Wright State University, Dayton, Ohio

The authors declare that they have nothing to disclose.

Correspondence: Jon Hyett, MD, RPA Women and Babies, Royal Prince Alfred Hospital, Camperdown, Sydney, NSW, Australia. E-mail:

© 2014 by Lippincott Williams & Wilkins.