The surplus embryos of good quality are subjected to embryo freezing. In cases of women suffering from ovarian hyper stimulation syndrome; doctors prefer to go with embryo freezing. This process is also popular with the name of cryopreservation. As per general data, in as many as 60% of IVF treatment cases, cryopreservation is advised and carried out by the expert doctors. This process is also helpful in lowering the cost of next IVF session.