Abstract
Ideally, the primary goal of assisted reproductive technology is to obtain the highest pregnancy success rate, without complications, after the first ovarian stimulation attempt. It is well known that subsequent transfer of cryopreserved-thawed embryos during a natural or a programmed cycle with exogenous steroids yields an excellent pregnancy rate. We wanted to see if post-cryopreservation In vitro culturing of all embryos produced from the initial batch of oocytes would improve success rates. We therefore cryopreserved all embryos two days after oocyte retrieval, thawed them when needed, and then reintroduced them to an In-vitro culture for up to 3 more days prior to uterine transfer.
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