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t le calcul de risque combiné utilisé dans l'estimation de risque prénatal de trisomie 21, laquelle est fausse ? A - Ce calcul tient compte de l'âge maternel; B - Ce calcul tient compte du dosage de marqueurs sériques dans le sang maternel; C - Ce calcul tient compte de l'épaisseur de la clarté nucale; D - Lorsque le risque estimé est de 1/522, un diagnostic prénatal invasif est proposé; E - Cette estimation de risque se fait au premier trimestre de la grossesse.

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