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Inicio Medicina Reproductiva y Embriología Clínica The Embryology Interest Group: updating ASEBIR's morphological scoring syste...
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Vol. 5. Issue 1.
Pages 42-54 (January - April 2018)
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Vol. 5. Issue 1.
Pages 42-54 (January - April 2018)
Consensus document
The Embryology Interest Group: updating ASEBIR's morphological scoring system for early embryos, morulae and blastocysts
Grupo de interés de embriología: actualización del sistema de clasificación morfológica ASEBIR para embriones tempranos, mórulas y blastocistos
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Irene Cuevas Saiza,
Corresponding author
icuevassaiz@yahoo.es

Corresponding author.
, Maria Carme Pons Gatellb, Muriel Cuadros Vargasc, Arantzazu Delgado Mendived, Natalia Rives Enedáguilae, Marta Moragas Solanesf, Beatriz Carrasco Canalb, José Teruel Lópezg, Ana Busquets Boneth, Mª Victoria Hurtado de Mendoza Acostai
a Hospital General Universitario, Valencia, Spain
b Institut Universitari Dexeus, Barcelona, Spain
c Segrelles IVF, A Coruña, Spain
d Institut Universitari IVI Valencia, Valencia, Spain
e Barcelona IVF, Barcelona, Spain
f Hospital Quirón Salud, Barcelona, Spain
g Clínica Equipo Juana Crespo, Valencia, Spain
h Centro Médico Teknon, Barcelona, Spain
i External advisor, Sevilla, Spain
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Tables (5)
Table 1. Data multicentre cleavage rate between D+2 and D+3 and implantation rate. Year 2017. Cleavage rate D+2–D+3: increase in number of blastomeres between both days of development. IR: implantation rate. p: p-value; significance p<0.05. LBR: recent live birth rate. Transferred: number of embryos transferred of each type. Implanted: number of embryos implanted of each type. Born: number of children born of each type.
Table 2. Embryo categorisation diagram according to presence of vacuoles.
Table 3. ASEBIR grading system for early embryos.
Table 4. ASEBIR scoring for morulae stage.
Table 5. ASEBIR scoring for blastocyst stage.
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Abstract

The Embryology Interest Group of the Association for the Study of Reproductive Biology has established a system of embryo scoring based on the bibliography published to date and the experience of the members of the group. This article sets out the morphological characteristics evaluated at each stage, as well as updating previous editions, from oocyte to blastocyst, and their influence on the potential for embryo development and implantation. Four categories are proposed with the purpose of standardising criteria and making it easier to run multicentre studies.

Keywords:
Embryo scoring
Blastocyst
Implantation
Embryo morphology
Resumen

Desde el Grupo de Interés de Embriología (GIE) de la Asociación para el Estudio de la Biología de la Reproducción (ASEBIR) se ha establecido un sistema de clasificación embrionaria basado tanto en la bibliografía publicada hasta la fecha como en la propia experiencia de los miembros del grupo. En el presente artículo se detallan las características morfológicas evaluadas en cada estadio, desde oocito hasta blastocisto y su influencia en el potencial de desarrollo e implantación embrionario. Se proponen 4 categorías con el propósito de unificar criterios y facilitar la realización de estudios multicéntricos.

Palabras clave:
Clasificación embrionaria
Blastocisto
Implantación
Morfología embrionaria

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