Following embryo transfer, any surplus embryos can be frozen. We would recommend freezing if two or more embryos of good quality are available. The advantage of freezing embryos is that they can be replaced in future cycle without having to undergo the IVF procedure again.
The results following the transfer of frozen thawed embryos depend on the number and quality of embryos available as well as the age of the woman. Nevertheless, fresh embryo replacement has a higher success rate. Frozen embryo transfer has been practiced since 1983 and there appears to be no increased incidence of foetal abnormality in babies born following this procedure.
Freezing embryos is an important responsibility for the couple, as they must decide whether or not they are planning to use the embryos in the future. They are responsible for keeping in touch with the Unit and notifying us of any change of address.
About 70% of all frozen embryos survive the thawing process. Although some couples may have all of their embryos survive in good condition, others may not have any that survive.
Replacement of frozen embryos is relatively simple. They can be replaced after providing the oval drug & followed by progesterone. Alternatively the woman's natural cycle is monitored to time ovulation using an ultrasound scan and ovulation predictor kits. Following ovulation, the embryos are thawed and transferred back to the uterus.