In conventional IVF, the embryo transfer was done in the uterus after 48 hours at 4-8 cell stage. In natural conception the embryo reaches the uterine cavity only on day 5. So embryos were put back at the wrong embryonic age at the wrong place and at the wrong time.

With the availability of new extended culture medium, we can now culture the embryos in the lab till the blastocyst stage (i.e day 5-6). Thereby increasing the chances of success dramatically to 50%.

                
4 Cell Embryo                               A fertilized egg

                 
A mature oocyte                                        ICSI


Embryo transfer