Blastocyst culture or long-term embryo culture consists of keeping the embryos obtained after in vitro fertilization for longer than usual, usually up to five or six days.

These embryos are introduced into incubators, allowing those with greater capacity for development to follow their evolution to the blastocyst stage.

This procedure advantages are: better embryo selection and better implantation capacity. With these improvements, the possibilities of pregnancy are increased.

This technique is recommended in those cases where several good quality embryo transfers have been performed and pregnancy has not been achieved or in those couples who do not wish to have a multiple pregnancy, for medical or family reasons.