What is a blastocyst embryo?

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A blastocyst embryo is one which has developed for 5 days after fertilization.   Not all embryos will develop to produce blastocysts.  Our embryologist may advise it is safer to consider a day three embryo transfer than risk having no blastocyst to transfer on day five.   Blastocyst transfer is typically an option for women who produce 10 eggs.

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