The traditional strategy in In vitro fertilization (IVF) was to perform embryo transfer following a fresh IVF treatment cycle involving controlled ovarian stimulation of the ovaries. Initially, even without the effective ways of freezing and thawing embryos, it was a strategy born from the necessity, as well as an intuitive thought that freezing would compromise embryo quality. Since that time, when excess to the embryos was first frozen with the aim at replacing them within the uterus in a non-stimulated cycle later on, technological advances have brought to growing numbers of embryos being effectively cryopreserved. Read more