It is the most commonly used in the presence of more embryos than the required number for transfer.
Pregnancy With Frozen Embryos
Increased embryos are generally cryopreserved on the 3rd or 5th day.
Another reason for embryo cryopreservation is the presence of ovarian hyperstimulation syndrome in women (OHSS). All of the embryos are cryopreserved without performing any transfer procedure, since a possible pregnancy will further aggravate the condition. After OHSS regress, they are thawed and transferred.
In some cases, chromosomal analysis of embryo may be necessary. If the screening will be performed for all chromosomes, the time required for the examination is long. Therefore, the embryos are kept cryopreserved until the chromosomal analysis is resulted.
In general, a new pregnancy chance is obtained with a much more modest financial cost without oocyte growth and retrieval again thanks to embryo cryopreservation techniques. The cryopreserved embryos are disposed after 3 years in accordance with the IVF regulation.