New method for embryo cryopreservation

Vitrification is a new freezing method where the embryo is frozen extremely quickly. The method is better to prevent crystal formation inside the cells and increases survival after thawing.

Many embryos have too much fragments on the day of embryo transfer to be frozen. We now culture all normal embryos to the sixth day to see whether they develop into good quality blastocysts. You can then freeze them at the blastocyst stage instead (have a look into the lab and see what a blastocyst looks like).

This new procedure means, that we cannot tell you on the day of embryo transfer if there are any embryos for freezing. You have to sign the permission paper at the day of embryo transfer. If there are good quality blastocysts, we will freeze them at day 5 or 6 and send one copy of the permission paper to you. The lab will keep the other copy.

If you do not receive a letter with the permission paper, there were no embryos for freezing.