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Blastocyst Transfer
Blastocyst embryo transfer is a specialized In Vitro Fertilisation (IVF) technique in which an embryo that has been cultured to the blastocyst stage is transferred to the womb. It is at the blastocyst stage of development (five days after fertilization) that an embryo would normally move out of the fallopian tube and into the uterus. Once in the uterus, the blastocyst starts to attach to the uterine lining in a process known as implantation.
The advantage of attempting to grow embryos to the blastocyst stage is that they should have a greater chance of implantation because the phase of embryo development matches the uterine environment. As a result, fewer embryos can be replaced, which will minimize the risk of a multiple pregnancy. The disadvantage is that fewer embryos will “survive” or grow to this phase (probably about 30%-50% of them). There is a possibility (up to 10%) that none will reach the blastocyst transfer stage and therefore no embryos will be available for transfer. The availability of “extra” embryos for freezing is also significantly reduced.
