Frozen Embryo Transfer [FET]

Frozen thawed embryos can be transferred into the uterus either in a natural cycle or in a down regulated cycle.

Natural Cycle FET:

It can be done if you have ovulatory cycles. Your cycles would be monitored by scans for follicular growth and ovulation and the embryos are transferred at the appropriate time following ovulation.

Down Regulated FET:

Your natural cycle is suppressed using medications and a period is artificially induced, followed by hormonal medication to prepare the uterus.

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Fertility Preservation Egg & Embryo Freezing

The most common indications for fertility preservation includes the below following options.

• Cancer patients as a part of the fertility preservation strategy in those who are scheduled for cytotoxic chemotherapy.
• Stored as a backup when patients are undergoing fertility treatment especially when they have low counts/ collection problem or deteriorating semen parameters.
• It is also stored for donation for a period of six months as a part of the donor quarantine for infectious diseases.

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Embryo Freezing and Frozen Embryo Transfer

Embryo freezing is a process where in the unused embryos are frozen at -196 degrees in liquid nitrogen using a method called vitrification. The embryos are normally stored up to five years subject to periodic renewal of charges. If you wish to continue beyond that period, the centerhas to be intimated about it. If you wish to discontinue before five years, again you have to intimate the center and you have the option of either discarding them or donating them for research or donating them for third party reproduction (as an anonymous donor).

Blastocyst is a day 5 embryo. It consists of an outer trophectoderm and an inner cell mass. It is at this stage of the embryo that it gets implanted in the uterus when conception occurs naturally. Only good quality embryos reach this stage when incubated in the laboratory after activation of embryonic genome.

Thus when a blastocyst is transferred into the well prepared uterus during the window of implantation, it will have an implantation potential of 50-60%.