Embryos are transferred into the uterus usually on the 3^rd day or occasionally on the 5^th day after egg collection. During the time they spend out of the body they are kept in culture medium in incubators that mimic the fallopian tubes.

Embryo transfer is an easy procedure that is done without anesthesia or sedation. The embryos are loaded into a plastic catheter that is then introduced into the uterus via the cervical canal.

The number of embryos transferred depends on the age of the woman, previous failed treatment attempts and embryo quality. Usually no more than 2-3 embryos are transferred.