Quality B embryos present localized fragmentation that occupies between 10 and 25% of the size. Their blastomeres are not perfectly symmetrical although they do have a single nucleus. The zona pellucida can be normal or present alterations in some cases.
Grade B Embryo
By Edurne Martínez Sanz BSc, MSc (senior clinical embryologist), José Muñoz Ramírez BSc, MSc, PhD (senior clinical embryologist), Mark P. Trolice MD, FACOG, FACS, FACE (reproductive endocrinologist), Marta Barranquero Gómez BSc, MSc (embryologist), Neus Ferrando Gilabert BSc, MSc (embryologist), Zaira Salvador BSc, MSc (embryologist) and Romina Packan (invitra staff).
Last Update: 10/24/2019