How do the specialists decide what is a good quality egg?
Retrieved eggs are surrounded by cumulous cells, that mask the true nature of the egg until they are removed by the sperm, about 19 hours after insemination. Then, the embryos have to develop due to a specific timeline (four-cell stage on day 2 and an eight-cell stage on day 3). When this process has taken place, your specialist is able to comment with some confidence on whether the particular embryo is a “good” one.
Interestingly, embryos that develop faster, or slower than this timeline, are generally, but not always, of lesser quality.
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