During in vitro fertilization (IVF) or intra-cytoplasmic sperm injection (ICSI) treatment, fertility drugs are used to stimulate the ovaries to produce more eggs than usual. These are then fertilized with your partner's, sperm to create embryos.
Because there is normally a number of unused embryos, some people choose to freeze the good quality unused embryos for use in later treatment cycles or for donation.
When is embryo freezing (cryopreservation / storage) considered?
Freezing (cryopreservation / storage) unused embryos for the following reasons:
It gives the option of using the embryos in future IVF or ICSI cycles, without having to go through the risks, expense and inconvenience of using fertility drugs and undergoing egg collection again.
If treatment needs to be cancelled after egg collection for any reason (e.g.,bad reaction to fertility drugs, ovarian hyperstimulation, hydrosalpinx, fluid in the endometrial cavity), embryo's can be frozen and used for future use.