Good quality embryos obtained with In Vitro Fertilisation (IVF) or Intracytoplasmic sperm injection (ICSI), can be frozen to obtain pregnancy later in the cycle.
This method consists in fast-freezing embryos through cryopreservation. This technique, which was recently developed, avoids the formation of ice crystals which damage the embryos, as occurred with the conventional slow freezing techniques, allowing greater rates of survival and pregnancy after defrosting.
Survival rates after defrosting with this technique are around 85%. The quality of the embryo before cryopreservation is a decisive factor for survival.