Egg freezing Germany

Unfertilized oocytes could be frozen so far, but after thawing had a very poor chance of survival and therefore only a low pregnancy rate. Since 2010, however, thanks to a new freezing technique - vitrification - it is also possible to freeze these cells very well. If more oocytes than those intended for embryo transfer have been fertilized as part of in vitro fertilization (IVF treatment) or ICSI treatment, they may be frozen in the pronuclear stage (a fertilized egg up to a maximum of 20 hours after fertilization), so that they are available for any further or desired further embryo transfers without the need for a renewed stimulation treatment. These oocytes can be stored for years at -196 ° C. Only about 20% of oocytes are damaged during cryopreservation. The chance of getting pregnant through freeze-conserved ova is still around 23%, depending on the number of oocytes transferred.