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HOW
SHOULD THE ULTRASOUND ESTIMATED DUE BE CALCULATED?
Debbie Nisbet, Specialist Ultrasound, Royal Women's Hospital,
Melbourne
Lachlan de Crespigny, Associate Professor, Department of
Obstetrics and Gynaecology, University of Melbourne; Honorary
Fellow, Murdoch Children's Research Institute, Royal Children's
Hospital, Melbourne
Abstract
Arguably the most important contribution ultrasound has
made to modern obstetric care is to enable an accurate estimate
of the due date. When performed by appropriately trained
personnel, ultrasound dating of pregnancies at less than
22 weeks’ gestation gives a more accurate estimated
due date (EDD) than the last menstrual period (LMP) even
for women with “certain” dates. When calculating
the EDD by ultrasound, the earliest ultrasound should provide
the most accurate estimate. Multiple parameters should be
used to assess the gestational age.
Citation
Nisbet D, de Crespigny L. How should the ultrasound estimate
due be calculated? ASUM Bulletin 2002.1:20-21.
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Bulletin