Embryo freezing is a process that allows the preservation of good quality embryos in liquid nitrogen at -196 ° C for long periods of time, preserving their physical and functional integrity without deteriorating over time.


Embryo freezing is performed on all those occasions when the number of good quality embryos is greater than the number of embryos to be transferred to the uterus in an In Vitro Fertilization cycle.

This situation is increasingly common in IVF cycles for improvements in all aspects of treatment.

These frozen embryos can be used in a new attempt later in the process known as cryotransfer, without the need to go through ovarian stimulation again.

What allows embryo freezing?

  • To conserve the embryos indefinitely (within the current legal framework contemplated in Law 14/2006)
  • Preserving the quality of the embryos
  • Accumulate embryos for preimplantation genetic studies
  • Achieving more than one pregnancy with a single In Vitro Fertilization cycle

Vitrification is the freezing technique used for cryopreservation of embryos

This technique is based on the use of high concentrations of cryoprotectants, which are molecules that protect the cell membranes of the embryos from the ice crystals that would be formed when the embryos are subjected to very low temperatures.

Once frozen, the embryos are stored, carefully identified, in Embryo Banks. These banks are monitored 24 hours a day, 365 days a year to guarantee that the embryos are always and uninterruptedly immersed in liquid nitrogen at a temperature of -196ºC, which allows them to maintain their viability over the years.

In order to guarantee a good probability of success in the embryo freezing programmes, it is necessary to select very well the embryos to be frozen in each case, since the quality of the embryo before being frozen will later mark its own capacity to implant.


of survival to the thawing process


It’s quite simple. All you have to do is contact Embriogyn and make an appointment with our specialists at the time that suits you best. In case you can’t come in person to the clinic, visits can also be arranged via Skype.