It is preferable to perform a PGD on day 5, when the embryo is in the blastocyst stage, since it is more developed and allows a greater number of cells to be analyzed, which improves the diagnosis and reduces the possibility of error.
Furthermore, the cells biopsied in the blastocyst are from the trophoectoderm, the external part of the embryo, so all the cells that will give rise to the future fetus are preserved intact.
Read the full article on: The PGD Process Step by Step ( 55).
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)