Blastocyst-Stage Extended Culture
Blastocystembryo transfer is a specialized Artificial insemination Fertilisation (IVF)
method in which an embryo that has been cultured to the blastocyst phase is
moved to the womb.
It
goes to the blastocyst stage of advancement (five days after fertilisation)
that an embryo would typically vacate the fallopian tube and also into the
uterus. When in the womb, the blastocyst begins to connect to the uterine
cellular lining in a process called implantation.
The
advantage of attempting to expand embryos to the blastocyst phase is that they
must have a better possibility of implantation because the stage of embryo
growth matches the uterine setting. Because of this, fewer embryos can be
changed, which will minimise the threat of a numerous maternity.
The
disadvantage is that fewer embryos will certainly "survive" or expand
to this phase (probably about 30%-50% of them). There is an opportunity (up to
10%) that none will reach the blastocyst transfer phase and therefore no
embryos will certainly be offered for transfer. The accessibility of
"added" embryos for freezing is also substantially reduced.
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