Egg freezing is a very useful technique that helps a woman to protect her fertility till the time a woman ready to start her family. During the process of the egg-freezing cycle, a patient has to go through various steps that are same as that involved in a typical IVF cycle: stimulation of ovulation, ultrasound monitoring, and retrieval of the ovum. After egg retrieval, the eggs are cultured for a period of few hours, after which they are frozen the same day to be used in future.
Embryo freezing is used and recommended when there are high-quality embryos remaining even after the process of embryo transfer. These embryos stay frozen until the patient is ready to use them. for patients who have completed their families, they can donate these frozen embryos to another couple, research or training.
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If there are any excess and healthy embryos from the IVF process they are usually frozen, in case one might need more than one treatment cycle. Freezing embryos, which is commonly called cryopreservation, accounts to around 60% of all patients going for IVF treatment “ and frozen embryo transfers occur for around 50% of all IVF births in our program.
Embryo freezing gives immense opportunities for pregnancy occurring from each IVF stimulated cycle. For instance, if a number of normal embryos are collected in an IVF cycle, we might recommend transferring of one or two of them and freezing the rest. This gives scope for further embryo transfers in later cycles without having to undergo a full stimulated IVF cycle if pregnancy failed to occur in the first cycle. If a baby is successfully conceived during the stimulated IVF cycle then the frozen embryos can be used afterwards for another pregnancy without the need of ovulation induction.
Embryo freezing thus gives further opportunities for conceiving pregnancy for each hormone stimulation cycle and ovum collection.
During an IVF cycle, more than one embryo can be created. however, there are severe risks associated with multiple gestations, so normally, we do not transfer more than one embryo at a time.
For example, if we manage to get two or three normal embryos (this does not the case always) what we recommend is transferring one and freezing the others. If you fail to become pregnant in that first cycle, we can transfer another embryo.
This process is called a Frozen Embryo Transfer (FET), which ensures you won’t have to undergo another cycle of ovulation triggering and egg collection.
While undergoing an IVF treatment cycle any extra embryos will be stored where they will be kept frozen in cryostorage until you decide to either use, donate or discard them.
Embryos are frozen from Day 2, which is in four cell stage to Day 5, which is also known as Blastocyst). These are then placed in tiny plastic straws, tapered at both ends, and labelled with your identification number and name.
Embryos are then kept in a freezing machine, where the temperature quickly drops to -150° Celsius. The straws are then put in cups and placed into tanks that are filled with liquid nitrogen, that helps in keeping the temperature at -196° Celsius. s.
Many of the births at our clinic for many years have occurred from the transfer of frozen and dissolved embryos. On an average, the success rate of the frozen embryo is around 30%, but this mainly depends on the age of the woman’s ovum when the embryos are frozen.
So, if you froze your embryos during your first IVF cycle when you were 38 years of age and then use them when you’re 42, your fertility chance will be equivalent to that of a 38-year-old woman.
Once you know your family is complete, and you do not need your frozen embryos further, you can either donate them to another couple who are not able to conceive or Your specialist can discuss other options with you
If you or your partner is suffering from a serious illness or cancer and want to undergoing fertility treatment for you must go freezing embryos to be used for future pregnancy attempts..