Extracorporeal fertilization means that hormonal therapy will be prescribed. Healthy ovaries usually demonstrate good reaction to the stimulation of ovulation elaborating multiple follicles of the high quality. Time will come, the doctor will do the puncture, give the oocytes to the embryologist, who will do the following work of extracorporeal fertilization, thanks to what a new life will be able to be conceived.
Two or three embryos of high quality will be transferred into the uterus cavity.
As a rule the specialists of the clinic suggests that the patient will have the other embryos ( they may be 10-15 and even more) stored for cryopreservation. Cryopreservation is the process with the use of liquid nitrogen. Its temperature is about 196 grade that provides freezing cells activity.
This service is paid, if the first attempt however is unsuccessful, the other embryos may be used for the second attempt. According to the statistic data pregnancy occurs twice less frequent after cryoprotocol. But method of cryopreservation is very popular as this procedure is cheaper that usual protocol of the extracorporeal fertilization.
Less chances of successful extracorporeal fertilization with the use of cryoprotocol are explained with two reasons: embryos of lower quality are left for cryopreservation, the best embryos have been used before (in the fresh cycle).
This method has influence on the quality of the embryos. The process of freezing is sometimes followed by significant losses. Preparing to the transfer starts from 7-10 day of the cycle, when the woman has got appointment to the doctor of the clinic. Specialists start monitoring, investigate results of the blood test, ultrasonic examination thoroughly. Therefore they establish when ovulation will occur. Then the doctors make the decision to freeze embryos to carry out transfer.
Before transfer the doctor may prescribe additional course of hormonal treatment.