It consists in freezing good quality embryos that remain after embryo transfer, previous couples’ authorization. Thus, if the couple have frozen embryos, they doesn’t need to repeat completly the IVF treatment. Those embryos are thawed at the time they will be transferred to the woman. The transfer is done in the same way as if there were fresh embryos as long as they keep good quality after the thaw.
Sperm cryopreservation is available for men who wish to bank sperm for possible future use. During cryopreservation, the sperm is frozen and then stored in liquid nitrogen at very low temperatures. Men with certain conditions in which sperm have to be extracted through surgical means, or those who undergoes a vasectomy or a chemotherapy treatment, may consider freezing sperm for future use. Frozen sperm remain viable indefinitely and can be thawed for use in future fertility treatments.