{"id":40286,"date":"2026-09-15T13:51:09","date_gmt":"2026-09-15T12:51:09","guid":{"rendered":"https:\/\/now-fertility.com\/blastocistos-de-dia-5-o-dia-6-marca-la-diferencia-en-el-exito-de-la-fiv\/"},"modified":"2026-09-15T13:51:10","modified_gmt":"2026-09-15T12:51:10","slug":"blastocistos-de-dia-5-o-dia-6-marca-la-diferencia-en-el-exito-de-la-fiv","status":"publish","type":"post","link":"https:\/\/now-fertility.com\/es\/blastocistos-de-dia-5-o-dia-6-marca-la-diferencia-en-el-exito-de-la-fiv\/","title":{"rendered":"Blastocistos de d\u00eda 5 o d\u00eda 6: \u00bfmarca la diferencia en el \u00e9xito de la FIV?"},"content":{"rendered":"\t\t
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La mayor\u00eda de los embriones que se desarrollan hasta blastocisto lo hacen 5 d\u00edas despu\u00e9s de la fecundaci\u00f3n. Tradicionalmente, esta es la fase que se ha considerado con m\u00e1s probabilidades de dar lugar a un embarazo exitoso. Sin embargo, algunos embriones tardan un d\u00eda m\u00e1s en alcanzar la misma fase, pero aun as\u00ed pueden ser aptos para la transferencia. <\/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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Un nuevo estudio* tuvo como objetivo investigar si los resultados eran comparables entre los blastocistos de d\u00eda 5 y los de d\u00eda 6.<\/p>

Investigadores del Hospital Universitario de Z\u00farich analizaron 631 transferencias de blastocisto \u00fanico congelado realizadas entre 2017 y 2023. 541 de los blastocistos se congelaron el d\u00eda 5 y 90 el d\u00eda 6. Todos los blastocistos proced\u00edan de pacientes de un grupo de edad similar y no se realiz\u00f3 PGT-a para comparar la calidad de los embriones. <\/p>

Inicialmente, los resultados parec\u00edan mejores para los embriones de d\u00eda 5, con una tasa de nacimiento vivo del 30,3 % en comparaci\u00f3n con el 20,0 % para los de d\u00eda 6. Sin embargo, cuando se realizaron ajustes por la calidad embrionaria y otros factores que podr\u00edan haber influido en el \u00e9xito, se observ\u00f3 que los embriones de d\u00eda 6 ya no se asociaban de forma significativa con una menor probabilidad de nacimiento vivo. Tampoco hubo diferencias significativas en las tasas de embarazo cl\u00ednico, embarazo bioqu\u00edmico o aborto espont\u00e1neo. <\/p>

Estos hallazgos sugieren que no necesariamente debe considerarse que los blastocistos tienen menos potencial de \u00e9xito simplemente porque hayan tardado un d\u00eda adicional en desarrollarse. Otros factores pueden ser m\u00e1s relevantes que si el embri\u00f3n se convirti\u00f3 en blastocisto el d\u00eda 5 o el d\u00eda 6, y los blastocistos de d\u00eda 6 siguen teniendo potencial para dar lugar a embarazos exitosos y nacimientos vivos saludables. <\/p>

Esto tambi\u00e9n podr\u00eda significar que, para las pacientes que no logran que ning\u00fan blastocisto se desarrolle con \u00e9xito para el d\u00eda 5, seguir\u00e1 existiendo la posibilidad de disponer de embriones viables para transferir esperando un d\u00eda adicional de desarrollo.<\/p>

No obstante, debe tenerse en cuenta que este estudio fue un estudio retrospectivo de un \u00fanico centro, y el n\u00famero de blastocistos de d\u00eda 6 incluidos fue relativamente bajo. Estudios m\u00e1s amplios ayudar\u00edan a confirmar los hallazgos de forma concluyente. <\/p>

El equipo de NOW-fertility cree firmemente que la toma de decisiones individualizada en la transferencia embrionaria implica evaluar cada embri\u00f3n seg\u00fan su calidad, su estadio de desarrollo y las circunstancias cl\u00ednicas de cada paciente. La morfolog\u00eda embrionaria y el potencial de desarrollo deben considerarse siempre al seleccionar el embri\u00f3n m\u00e1s adecuado para la transferencia. Si se utiliza PGT-a tras la biopsia embrionaria el d\u00eda 5, una transferencia embrionaria en fresco el d\u00eda 6 tambi\u00e9n puede tener en cuenta el estado gen\u00e9tico del embri\u00f3n. <\/p>

El enfoque de NOW-fertility es maximizar las probabilidades de un resultado satisfactorio, con un embarazo saludable, en el menor tiempo posible.<\/p>

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*Carullo G, et al. (2026). Nacimientos vivos comparables en la transferencia de blastocisto \u00fanico vitrificado del d\u00eda 5 en comparaci\u00f3n con el d\u00eda 6: un an\u00e1lisis retrospectivo.<\/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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Programe una consulta gratuita<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Para reservar una consulta con uno de los prestigiosos especialistas de NOW-fertility, p\u00f3ngase en contacto con nosotros:<\/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\tCont\u00e1ctenos<\/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 mayor\u00eda de los embriones que se desarrollan hasta blastocisto lo hacen 5 d\u00edas despu\u00e9s de la fecundaci\u00f3n. Tradicionalmente, esta es la fase que se ha considerado con m\u00e1s probabilidades de dar lugar a un embarazo exitoso. Sin embargo, algunos embriones tardan un d\u00eda m\u00e1s en alcanzar la misma fase, pero aun as\u00ed pueden ser […]<\/p>\n","protected":false},"author":1,"featured_media":40287,"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":[145,136],"tags":[],"class_list":["post-40286","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-consejos-y-sugerencias","category-sin-categorizar"],"yoast_head":"\nBlastocistos de d\u00eda 5 vs. d\u00eda 6: \u00bfafecta al \u00e9xito de la FIV? | NOW-fertility<\/title>\n<meta name=\"description\" content=\"\u00bfLos blastocistos de d\u00eda 5 o d\u00eda 6 afectan a las tasas de \u00e9xito de la FIV? 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