On its second day in culture, the embryo shoould have 4 cells (blastomeres) of similar size. If it has another number of cells, its development speed is not correct. Furthermore, if it has fragments, vacuoles or other structures, this could affect its evolution.
Structure of a 2 days old embryo with 4 cells
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: 04/16/2020