Abstract
Objective: Day 5 blastocyst transfer has been proposed as a means of increasing implantation rates (IR) through selection of more viable embryos and decreasing multiple pregnancies through the use of fewer embryos. Other reports indicate this strategy only applies to select groups of patients. This retrospective study compared clinical pregnancy rates (CPR) and IR in different sub-sets of patients to test this hypothesis in a program where the mean number of embryos used in ET was <3, for D3 or 5 ET.
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