Under this form of treatment, the embryos can be observed for a longer period. Embryo transfer following IVF and ICSI is usually carried out on day two or three after the collection of eggs. Blastocyst Culture is an advanced treatment that allows to culture embryos for five or six days. Due to this, the embryologist can identify the aptest embryos for embryo transfer. It is well to be noted that this treatment allows the possibility to transfer the single best embryo and is usually beneficial for those patients who have a history of failed IVF.