Procedure of IVF
Embryo Freezing and Thawing
After embryo transfer, surplus embryos are frozen. Freezing is done at PN, 2-days, 3days or blastocyst stage depending on their development.
Embryos that reach blastocyst stage are frozen by using the vitrification method. Frozen embryos may be used by the couple in a subsequent cycle.
During thawing, the percentage of good quality embryos reaches 80%, while the percentage of pregnancies by means of transferring cryopreserved embryos is ~40%.
According to Greek legislation, frozen embryos may be preserved for a period of 5 years.
