How is Embryo Transfer done?
Four to six hours after the eggs and sperms are collected they are put together in the incubator. The eggs are fertilised by the sperms. After fertilisation takes place embryos can be transferred after two to three days. Embryos are transferred into the uterine cavity through the vagina with the help of special fine catheters. ET is a painless procedure and no anaesthesia is required. Normally 3-4 embryos are transferred if ET is done on the second or third day. However, if ET is done on the fourth or fifth day at an advanced stage of embryo development, only 1 to 2 embryos are sufficient to cause a successful pregnancy. Surplus embryos can be safely cryopreserved (preserve at very low temperatures) in liquid nitrogen at temperature of minus 196 degree centigrade and kept for an indefinite period. These embryos can be used after thawing (bringing back to room temperature) in any subsequent cycle.
