On its second day of culture, the embryo must have 4 cells (blastomeres) of similar size. If it has another number of cells, its speed of development is not adequate, and if it has fragments, vacuoles or other structures, they could affect its evolution.
Structure of an embryo with 4 cells on day 2
By Edurne Martínez Sanz BSc, MSc (senior clinical embryologist), Gorka Barrenetxea Ziarrusta MD, PhD (gynecologist), José Luis de Pablo BSc, MSc, PhD (senior clinical embryologist), José Muñoz Ramírez BSc, MSc, PhD (senior clinical embryologist), Neus Ferrando Gilabert BSc, MSc (embryologist), Zaira Salvador BSc, MSc (embryologist) and Romina Packan (invitra staff).
Last Update: 10/16/2019