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Depending upon
the quality of the developing embryos, a decision is
jointly taken by patient,as to how many embroys are to
be transferred in the uterus. Usually, 2 to 4
embryos are transferred. Te procedure is done without
anestesia where in an atraumatic cather is passed
trough the cervix into the womb The procedure is pain-free. It is
often a very reverent experience to see the embryos
placed into the womb. To reduce the risk of multiple
pregnancies we only transfer an appropriate no of
embroys into the uterus.
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As a result, you may have additional embryos that
we can freeze (cryopreserve) and store for transfer in a
future cycle. Embryo freezing may then provide you
with more than one opportunity to conceive from a
single egg recovery cycle. However, it is your choice
to select this option or not.
Embryo freezing involves laboratory techniques that
allow us to store the embryos in liquid nitrogen for
potentially very long periods of time. Studies have
not shown any increased risk of birth defects from
babies born after embryo freezing when compared with
those born from maternal age-matched naturally
conceived pregnancies. Furthermore, the age-related
pregnancy success rates and risk of birth defects
corresponds to your age when the eggs were fertilized,
not your age at the time you transfer them to your
uterus.
Preparation for the transfer of your frozen embryos
involves the use of estrogen and progesterone in
sequence to create a suitable “lining” layer in the
uterus to allow the embryos to implant. Only the
strongest appearing embryos are suitable for freezing,
but even with this pre-selection, it is possible that
some will not survive the freezing and thawing
process. Only at the time of expected embryo transfer
can we tell you how many embryos have survived the
thawing process.
Pregnancy rates following the transfer of frozen
embryos are similar to those following the transfer of
non-frozen or fresh embryos.
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