After a cycle of IVF there are often surplus, high-quality embryos, that were not transferred fresh (whether there were simply too many, or it was not medically possible to transfer any embryo in this cycle) but still have a good chance of creating a successful pregnancy. In these cases, we use the latest cryopreservation techniques known as vitrification to freeze and store your embryos for later use – be that the very next cycle, or for a future sibling much further down the road.