[The noninvasive prenatal testing for Down's Syndrome. Retrospective study of 8821 patients].
OBJECTIVE
To demonstrate the decrease in intrauterine invasive procedures through analysis of DNA fetoplacental free circulating in maternal blood: Non Invasive Prenatal Test (NIPT), in Prenatal Diagnosis Center of American Hospital of Paris (AHP).


METHODS
Retrospective descriptive study of 8821 patients in Prenatal Diagnosis Center at the AHP between 01/01/2012 and 09/25/2014. The NIPT is available to patients since 1st January 2013.


RESULTS
The number of invasive procedures decreased significantly (P<0.0001) between 2012 (n=1177, i.e. 42 % of the global activity of the Prenatal Diagnosis Center at the AHP in 2012) and 2013 (n=987 or 28.5 %) and between 2013 and 2014 (n=599 or 23.4 %). The NIPT calculated performance statistics are: sensitivity≥99.9 %; specificity=99.8 %; Positive Predictive Value=90.4 %; Negative Predictive Value≥99.9 %; False Positives=3. While the actual screening statistic values are: sensitivity≥95.4 %; specificity=82.5 %; Positive Predictive Value=6.5 %; Negative Predictive Value=99.9 %; False Positives=1197. The NIPT has reduced the number of invasive procedures at the Prenatal Diagnosis Center at the AHP. The NIPT performances are superior to those of the actual screening.
Centre de diagnostic prénatal, hôpital américain de Paris, 63, boulevard Victor-Hugo, 92200 Neuilly-sur-Seine, France. Electronic address: clemence.belloin@gmail.com.
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Belloin
Centre de diagnostic prénatal, hôpital américain de Paris, 63, boulevard Victor-Hugo, 92200 Neuilly-sur-Seine, France.
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Jacquemard
Centre de diagnostic prénatal, hôpital américain de Paris, 63, boulevard Victor-Hugo, 92200 Neuilly-sur-Seine, France.
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Bernabé-Dupont
Centre de diagnostic prénatal, hôpital américain de Paris, 63, boulevard Victor-Hugo, 92200 Neuilly-sur-Seine, France; Maternité Port-Royal, 53, avenue de l'Observatoire, 75014 Paris, France.
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Viot
Centre de diagnostic prénatal, hôpital américain de Paris, 63, boulevard Victor-Hugo, 92200 Neuilly-sur-Seine, France.
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Lohmann
Maternité Port-Royal, 53, avenue de l'Observatoire, 75014 Paris, France.
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Grangé
D000328:Adult; D004247:DNA / Q000097:blood*; D004314:Down Syndrome / Q000097:blood*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000097:blood*; D011296:Prenatal Diagnosis / Q000379:methods* / Q000592:standards; D012189:Retrospective Studies
D004247:DNA
ADN fœtal; ADN fœtoplacentaire; CfDNA; DNA fetoplacental; DPNI; Diagnostic invasif; Diagnostic prénatal; Down Syndrome; Dépistage combiné du premier trimestre; Dépistage prénatal non invasif; Fetal DNA; Invasive Diagnosis; Invasive Procedure; NIPT; Non Invasive Prenatal Testing; Prenatal Screening; Prélèvement invasif; Trisomie 21