Are there any changes in Down Syndrome prevalence in France following the implementation of the measurement of nuchal translucency and maternal serum screening?

Gynécologie, obstétrique & fertilité
J Goujard

Abstract

To evaluate the impact of prenatal screening for Down Syndrome in France in relation to the important changes in the French prenatal screening policy during the years 1996-1997: measurement of nuchal translucency and maternal serum screening, for all women. Data are those published from three congenital anomalies registries implanted in Centre-Est, Paris and Bas-Rhin areas, from 1990 to 2001. The livebirth prevalence of Down Syndrome decreased from 1/950 in 1990 to 1/1500 in 2000-2001. This decrease was observed from 1994 onwards but has proved stronger since 1996, in spite of the observed increase in the total prevalence partly explained by changes in the maternal age distribution. Extrapolated to all births in France, the calculated annual number of Down Syndrome births would decrease from 800-900 in 1990 to 500-600 in 2001. Consequently, the proportion of induced terminations following prenatal diagnosis increased from 38.6% in 1990 to 75.5% in 2001. In addition, the mean gestational age of the induced terminations is decreasing. It seems reasonable to assume that the observed trends followed the changes in the French national policy for prenatal screening: a mass screening for all women, whatever the maternal age.

References

Oct 8, 1988·BMJ : British Medical Journal·N J WaldJ A Canick
Apr 21, 1994·The New England Journal of Medicine·J E HaddowP A Boyd
Dec 1, 1995·British Journal of Obstetrics and Gynaecology·P P PandyaK H Nicolaides

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Citations

Feb 6, 2008·Gynécologie, obstétrique & fertilité·C de ViganF Goffinet
Jun 25, 2013·Journal de gynécologie, obstétrique et biologie de la reproduction·A LetourneauC Egoroff
Jul 1, 2010·Birth Defects Research. Part A, Clinical and Molecular Teratology·Guido CocchiGöran Annerén
Apr 7, 2010·International Journal of Legal Medicine·Anne-Laure Pelissier-AlicotGeorges Leonetti

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