What is embryo freezing and storage?

During in vitro fertilisation (IVF) or intra-cytoplasmic sperm injection (ICSI) treatment, fertility drugs are used to stimulate the ovaries to produce more eggs than usual.

IVF
Some people choose to freeze the good quality unused embryos Credit: Ben Birchall/PA Wire

These are then fertilised with your partner’s, or a donor’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.

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Frozen embryos 'boost for IVF'

Frozen embryos are more likely to produce successful, complication-free IVF pregnancies than those that are fresh, research suggests.