A Blastocyst transfer produces the best results and is considered preferable in IVF because it mimics the natural conception process by conventionally preparing your embryo to the appropriate stage. This synchronizes the development of the lining of your uterus and embryo to increase the chances of implantation.
Blastocyst culture exerts selection pressure on a group of embryos, implying only the strongest and fittest is chosen for the further stages. By selectively excluding slow-developing embryos before transfer level, Blastocyst culture increases the probability of transferring the embryo with the highest implantation potential, thus increasing your chances of experiencing a successful pregnancy!