Abstract
In the IVF laboratory, some real-life situations such as an obligation of single embryo transfer or a change of laboratory transfer strategy may lead to the re-vitrification of good-quality embryos becoming surnumerary. However, except for preimplantatory genetic screening (PGT) cases, no published data are available for FET with human embryos that were re-vitrified at different developmental stages. The aim of the study is to compare the embryonic impact and clinical outcome of a second vitrification of blastocysts obtained from early cleavage, versus blastocyst stage frozen/thawed embryos.
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