{"id":40280,"date":"2026-09-15T13:50:49","date_gmt":"2026-09-15T12:50:49","guid":{"rendered":"https:\/\/now-fertility.com\/blastocystes-de-j5-ou-de-j6-cela-fait-il-une-difference-sur-le-succes-de-la-fiv\/"},"modified":"2026-09-15T13:50:50","modified_gmt":"2026-09-15T12:50:50","slug":"blastocystes-de-j5-ou-de-j6-cela-fait-il-une-difference-sur-le-succes-de-la-fiv","status":"publish","type":"post","link":"https:\/\/now-fertility.com\/fr\/blastocystes-de-j5-ou-de-j6-cela-fait-il-une-difference-sur-le-succes-de-la-fiv\/","title":{"rendered":"Blastocystes de J5 ou de J6 : cela fait-il une diff\u00e9rence sur le succ\u00e8s de la FIV ?"},"content":{"rendered":"\t\t
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La plupart des embryons qui se d\u00e9veloppent en blastocystes le font 5 jours apr\u00e8s la f\u00e9condation. Traditionnellement, c\u2019est le stade consid\u00e9r\u00e9 comme le plus susceptible d\u2019aboutir \u00e0 une grossesse r\u00e9ussie. Cependant, certains embryons mettent un jour de plus pour atteindre le m\u00eame stade, tout en pouvant rester adapt\u00e9s au transfert. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Une nouvelle \u00e9tude* visait \u00e0 d\u00e9terminer si les r\u00e9sultats \u00e9taient comparables entre les blastocystes de J5 et de J6.<\/p>

Des chercheurs de l\u2019H\u00f4pital universitaire de Zurich ont analys\u00e9 631 transferts uniques de blastocystes congel\u00e9s r\u00e9alis\u00e9s entre 2017 et 2023. 541 blastocystes ont \u00e9t\u00e9 congel\u00e9s au J5 et 90 au J6. Les blastocystes provenaient tous de patientes d\u2019une tranche d\u2019\u00e2ge similaire et le PGT-a n\u2019a pas \u00e9t\u00e9 r\u00e9alis\u00e9 afin de comparer la qualit\u00e9 des embryons. <\/p>

Au d\u00e9part, les r\u00e9sultats semblaient meilleurs pour les embryons de J5, avec un taux de naissances vivantes de 30,3 % contre 20,0 % pour ceux de J6. Toutefois, apr\u00e8s ajustement pour la qualit\u00e9 embryonnaire et d\u2019autres facteurs susceptibles d\u2019influencer le succ\u00e8s, les embryons de J6 n\u2019\u00e9taient plus significativement associ\u00e9s \u00e0 une probabilit\u00e9 plus faible de naissance vivante. Aucune diff\u00e9rence significative n\u2019a non plus \u00e9t\u00e9 observ\u00e9e concernant les taux de grossesse clinique, de grossesse biochimique ou de fausse couche. <\/p>

Ces r\u00e9sultats sugg\u00e8rent que les blastocystes ne doivent pas n\u00e9cessairement \u00eatre consid\u00e9r\u00e9s comme ayant un potentiel de r\u00e9ussite moindre simplement parce qu\u2019ils ont mis un jour suppl\u00e9mentaire \u00e0 se d\u00e9velopper. D\u2019autres facteurs peuvent \u00eatre plus pertinents que le fait que l\u2019embryon soit devenu un blastocyste au J5 ou au J6, et les blastocystes de J6 conservent le potentiel d\u2019aboutir \u00e0 des grossesses r\u00e9ussies et \u00e0 des naissances vivantes en bonne sant\u00e9. <\/p>

Cela pourrait \u00e9galement signifier que, pour les patientes chez qui aucun blastocyste ne se d\u00e9veloppe avec succ\u00e8s au J5, il reste possible de disposer d\u2019embryons viables \u00e0 transf\u00e9rer en attendant un jour suppl\u00e9mentaire de d\u00e9veloppement.<\/p>

Il convient toutefois de noter que cette \u00e9tude \u00e9tait une \u00e9tude r\u00e9trospective monocentrique, et que le nombre de blastocystes de J6 inclus \u00e9tait relativement faible. Des \u00e9tudes plus vastes aideraient \u00e0 confirmer ces r\u00e9sultats de mani\u00e8re concluante. <\/p>

L\u2019\u00e9quipe de NOW-fertility est fermement convaincue que la prise de d\u00e9cision individualis\u00e9e en mati\u00e8re de transfert embryonnaire implique d\u2019\u00e9valuer chaque embryon selon sa qualit\u00e9, son stade de d\u00e9veloppement et la situation clinique de chaque patiente. La morphologie embryonnaire et le potentiel de d\u00e9veloppement doivent toujours \u00eatre pris en compte lors de la s\u00e9lection de l\u2019embryon le plus appropri\u00e9 pour le transfert. Si le PGT-a est utilis\u00e9 apr\u00e8s une biopsie embryonnaire au J5, un transfert d\u2019embryon frais au J6 peut \u00e9galement tenir compte du statut g\u00e9n\u00e9tique de l\u2019embryon. <\/p>

L\u2019approche de NOW-fertility consiste \u00e0 maximiser les chances d\u2019un r\u00e9sultat favorable, avec une grossesse en bonne sant\u00e9, dans les d\u00e9lais les plus courts possibles.<\/p>

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*Carullo G, et al. (2026). Naissances vivantes comparables apr\u00e8s transfert unique de blastocyste vitrifi\u00e9 : comparaison du J5 au J6 : une analyse r\u00e9trospective.<\/em> Reproductive BioMedicine Online, 53(4), 105796.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Planifier une consultation gratuite<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Pour r\u00e9server une consultation avec l\u2019un des consultants renomm\u00e9s de NOW-fertility, veuillez nous contacter :<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tContactez-nous<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

La plupart des embryons qui se d\u00e9veloppent en blastocystes le font 5 jours apr\u00e8s la f\u00e9condation. Traditionnellement, c\u2019est le stade consid\u00e9r\u00e9 comme le plus susceptible d\u2019aboutir \u00e0 une grossesse r\u00e9ussie. Cependant, certains embryons mettent un jour de plus pour atteindre le m\u00eame stade, tout en pouvant rester adapt\u00e9s au transfert. Une nouvelle \u00e9tude* visait \u00e0 […]<\/p>\n","protected":false},"author":1,"featured_media":40281,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[33,67],"tags":[],"class_list":["post-40280","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-fr","category-trucs-conseils"],"yoast_head":"\nBlastocystes de J5 vs J6 : cela affecte-t-il le succ\u00e8s de la FIV ? | NOW-fertility<\/title>\n<meta name=\"description\" content=\"Les blastocystes de J5 ou de J6 influencent-ils les taux de r\u00e9ussite de la FIV ? 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