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It is routine in programs performing blastocyst transfer to cryopreserve embryos on both Day 5 and Day 6. There are two reasons for this. First, we will freeze no embryo before it's time. Blastocyst stage embryos freeze best when they are fully expaned (which sometimes takes until Day 6 to occur). Secondly, it is important to assess the quality of the embryo prior to freezing (poor uality embryos do not ususaly survive the freeze/thaw process). The embryo must be fully expanded to determine if there are a suffient number of stem cells within the embryo to make a baby.
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