Cryopreservation of embryos
During the procedure of in vitro fertilization it is possible to obtain more embryos than suggested for transfer. In such cases, the cryopreservation and storage of embryos services can be performed at the request of the patients.
Cryopreservation process involves freezing of pre-prepared in special environments “saturated” with cryoprotectants embryos being placed into the cryo carrier, which is then promptly immersed into the liquid nitrogen. The cryo carrier contains general information about the patient. In that cool and restful “house” the embryos can be waiting for years till the thawing process.
When the time “X” comes, the embryo is thawed. The thawing process involves the unfreezing embryo by washing it out of cryo-holder using special liquid and then “dragging” thru solutions, allowing the cryoprotectants to yield to the water instead. And there you have got alive, healthy and strong embryo which is ready for transfer!
Modern cryo methods are very effective – more than 95% of all of the vitrified embryos being successfully thawed. The pregnancy rates using cycles of cryopreserved embryos are equal or even exceeding the same indices of cycles using fresh embryos.
Cryopreservation of oocytes
Vitrification is the most advanced method of cryopreservation that successfully used to preserve oocytes. However, it is essential to keep in mind that women’s cells are vulnerable at the freezing process, and consequently the efficiency of vitrification of oocytes is slightly lower than the results of embryo vitrification.
In what cases the oocytes cryopreservation is recommended?
- women who are faced with functional impairment or subject to ovaries removal, to give a birth to a biological child in the future;
- patients diagnosed with cancer – prior to chemo and x-ray therapy, as it leads to deprivation of the reproductive cells quality;
- women who need to delay the moment of getting pregnant for whatever reasons without losing the reproductive potential.
Nonetheless the important component of the assisted reproductive technologies is the sperm cryopreservation. Sperm cells are quite hardy and tolerant to freezing and thawing, which allows using thawed sperm for in vitro fertilization.
In what cases the sperm cryopreservation is recommended?
- men who will undergo a complex treatment or who work in hazardous environment;
- if the partner is not able to be physically present in the clinic on the day of IVF.
Please, note that the cryopreservation process does not affect to the health of the unborn baby, however, it is likely that the cold season would be its favorite time of a year.