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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