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Dating biometry during the first trimester: accuracy of an every-day practice
G Grange1, E Pannier, F Goffinet
1Service de Gynécologie-Obstétrique I, Maternite Port-Royal Baudelocque, Hôpital Cochin-Université René Descartes, Paris V, France. gilles.grange@cch.ap-hop-paris.fr
Objective:
The goal of this study was to determine the accuracy of an every-day practice for assessing gestational age by ultrasound measurement of the greatest embryonic length (GEL).
Design:
This retrospective study used measurements taken during the first trimester.
Subjects:
We considered all births in this hospital between 1 January 1992 and 31 December 1994 from pregnancies that began by an in-vitro fertilization procedure (IVF). We examined 143 consecutive files, containing 257 measurements made by 72 different operators.
Methods:
The precision of seven embryo growth curves was compared. We calculated for each curve its ability to predict (95% prediction interval) the date the pregnancy began, using these dated pregnancies.
Result:
For GEL measurements between 3 and 80 mm, which includes most of our population, Robinson and Wisser (2) were the most appropriate curves. The 95% prediction interval was 9.5 and 10.2 days respectively.
Conclusion:
Dating pregnancies in every-day practice with GEL is nearly as accurate as prospective studies with only one or two scanners.