Published online by Cambridge University Press: 03 June 2019
Cryopreservation is a fundamental adjunct for any in vitro fertilisation (IVF) programme for both gametes and embryos. Sperm can be frozen for use in donor cycles, treatment cycles or to preserve fertility. After the first successful frozen-thawed embryo live birth was reported in 1983, embryo cryopreservation is routinely used to store supernumerary embryos, to improve cumulative pregnancy rates and to help effectively implement a single embryo transfer policy. However, oocyte cryopreservation has proved to be more challenging as the survival rates and pregnancy rates were initially low.
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