What is Frozen Embryo Transfer?
Frozen
Embryo Transfer (FET) is a part of IVF treatment where a frozen embryo, which is
created using a full IVF cycle, is thawed and transferred into a woman’s uterus,
under the guidance of ultrasound. Embryos are transferred into a woman uterus by a simple painless procedure.
In an
IVF cycle, one or more embryos develop, and these embryos are usually frozen for
later use. Usually, only one or two embryos are transferred into the women’s
uterus during an IVF cycle as there are more chances of multiple pregnancies.
The remaining embryos are frozen for future use. The embryos in day 2 (four-cell
stage) - day 5 (blastocyst stage) are frozen to be used. These embryos are
transferred to a freezing machine where the temperature is made to drop rapidly
to -150 degrees Celsius and then stored in liquid nitrogen tanks at -196 degrees
Celsius.
Sometimes
even fresh embryos are transferred without freezing the embryos and this is
called a fresh embryo transfer or just embryo transfer.Freezing the embryo gives
you more chances of pregnancy with one hormone stimulation cycle and egg
retrieval. If that cycle has not resulted in pregnancy then the frozen embryo
is transferred into the woman’s uterus, so you will not have to again through the
hormone stimulation cycle.
The success of the frozen embryo has increased substantially because the chance of
pregnancy increases per egg retrieval from the uterus. It saves a lot of time
and money.
Currently,
GarbhaGudi follows a “Freeze-All” policy in IVF cycles as the success rates in
FET is more than fresh transfers. The success rate in FET cycles depends on various
factors like
·
Quality of the
embryos
·
Culture condition
·
Freezing and thawing
techniques
·
Quality of the media
used for freezing and thawing
·
Skills of the
embryologist
·
Embryology lab
conditions
·
Skills of the clinician who is transferring the embryo
·
Luteal phase support
that is given after the transfer
·
Ability of the
woman’s uterus to support the growth of the fetus
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