Any embryos remaining after the process of embryo transfer are assessed for their suitability for cryopreservation. Embryos of suitable quality, and those at the correct stage of their development on the day of transfer, i.e. those most likely to survive the cryopreservation process, are selected for cryopreservation.
Frozen embryos may be kept in storage for up to ten years (the statutory storage period) although in some specific circumstances they may be stored for longer than this. There will usually be a fee for the on-going storage of cryopreserved embryos and your clinic will make you aware of this before you consent to this procedure.