Vitrification is the method of cryopreservation most widely used in assisted reproduction, particularly in the cases of oocytes and embryos. The freezing process is very fast in order to prevent the formation of ice crystals that could damage the cells, and cellular survival and viability rates are very high.Thanks to this technique, embryo transfer results for thawed embryos have improved considerably over recent years.
When is it recommended?
- In all in vitro fertilisation cyclesfecundació in vitrowhere there are remaining embryos after embryo transfer. This process makes a new embryo transfer possible: the embryos can subsequently be thawed at a convenient time for the couple concerned.
- In those cases where transfer in the same cycle where the puncture procedure has been carried out is either not possible, or not recommended for various reasons, such as the risk of ovarian hyperstimulation, the presence of polyps, hydrosalpinx, hydrometra, etc…or a lack of sperm on the day of puncture.
- Where patients intend to postpone maternity for a time, and decide to conserve their gametes.
- In order to accumulate oocytes or embryos in cases of patients where response to treatment has been very limited. Particularly recommended for couples where genetic screening has been carried out due to the risk of transmission of a specific disease, as in these instances it is necessary to have a good number of embryos.