Early cleavage, embryo cell number and embryo quality (sequential assessment) of the human cleavage stage embryo are associated with high rates of blastocyst …

KL Douglas, P Wale, J Stevens, WB Schoolcraft… - Fertility and …, 2005 - fertstert.org
Objective Embryo selection in clinical IVF is based primarily on embryo morphology.
Typically, assessment of morphological criteria is performed immediately prior to transfer.
However, there is growing evidence that there are key parameters at successive stages of
embryo development that are related to transfer outcome. It was therefore the aim of this
work to record parameters on successive days of preimplantation development and relate
them to blastocyst development. Design
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