Blastocysts
are the incubated embryos after five or six day’s growth. Best quality embryos
are selected and separated from the rest at this stage only. These separated
high quality embryos are then cultured in the incubator. Out of these incubated
embryos which were best amongst a lot, one or two are selected to be implanted
in womb. These selected incubated embryos are blastocysts.
Pregnancy
shall be successful only if these blastocysts stick themselves to the wall of
womb after implantation. And this is the reason for implanting more than one
blastocyst. So that atleast one of them attaches itself to the walls of womb.
Blastocyst transfer improves the IVF success rate. This
works well with younger women with reasonable pregnancy probability and good
quality embryos. Because, blastocyst transfer shall be successful only if
embryos are of good quality.
This
process of blastocyst transfer helps achieving success in pregnancy because
blastocysts are more robust and strengthened embryos of six days incubation
than that of normal embryos of two or three day’s growth.
But
as nothing in this world is infallible, so is the process of blastocyst. There
are few setbacks and risks associated with it. Firstly, due to poor motility,
sometimes embryos don’t show any development after day two when it reaches four
cell stage. So it is not possible to incubate and select blastocyst. Next is
that there are chances of as number of multiple births as number of blastocysts
are transferred.

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