San Diego Embryo Development
The following day after eggs have been inseminated or injected with a single
sperm (ICSI), they are examined for signs that the process of fertilization
is underway. At this stage, normal development is evident by the still
single cell having 2 nuclei; this stage is called a zygote.
Embryo development usually proceeds as follows:
- Two days after insemination or ICSI, normal embryos have divided into about 4 cells.
- Three days after insemination or ICSI, normally developing embryos contain
about 8 cells.
- Five days after insemination or ICSI, normally developing embryos have
developed to the blastocyst stage, which is typified by an embryo that
now has 80 or more cells, an inner fluid-filled cavity, and a small cluster
of cells called the inner cell mass.
It is important to note that since many eggs and embryos are abnormal,
it is expected that not all eggs will fertilize and not all embryos will
divide at a normal rate. The chance that a developing embryo will produce
a pregnancy is related to whether its development in the lab is normal,
but this correlation is not perfect. This means that not all embryos developing
at the normal rate are in fact also genetically normal, and not all poorly
developing embryos are genetically abnormal. Nonetheless, their visual
appearance is the most common and useful guide in the selection of the
best embryo(s) for transfer.
We Monitor Eggs for Quality
The Hanabusa Embryologist Team gives special care throughout every step
of a couple’s journey to parenthood. Just as our approach to IVF
retrieving the best quality eggs and combining them with the healthiest sperm, we similarly make a great
effort to ensure that we carefully nurture your embryos so that they can
develop into advanced stage embryos. With that done, we then culture embryos
to the blastocyst stage (usually around day 5) so that we can identify
and eliminate poorer quality embryos and avoid failed embryo transfers