BACKGROUND Multiple pregnancies are one of the major safety concerns of in vitro fertilization (IVF) due to the increased risk of maternal and neonatal complications. Single embryo transfer is the most effective way to reduce the risk of multiple pregnancies. Selection of the embryo and optimization of the implantation environment are crucial to retain the success rate when the number of transf...

Abstract Study question How does the embryo morphological grade and day of vitrification affect FET outcomes from in vitro fertilization cycles utilizing preimplantation genetic testing for aneuploidy (PGT-A)? Summary answer The a transferred affects age groups differently, Day-5 embryos have significantly better pregnancy than Day-6 embryos. What is known already use PGT-A has shown to increas...

OBJECTIVE To determine the preferred regimen for women with adenomyosis undergoing in vitro fertilization (IVF), we compared the IVF outcomes of fresh embryo transfer (ET) cycles with or without gonadotropin-releasing hormone (GnRH) agonist pretreatment and of frozen-thawed embryo transfer (FET) cycles following GnRH agonist treatment. METHODS This retrospective study included 241 IVF cycles ...

BackgroundThe number of frozen Embryo transfers (FET) in invitro fertilization cycles (IVF) is increasing and has already surpassed numbers fresh stimulated IVF cycles. Increasing elective single ETs are also resulting more embryos available for subsequent FET Most commonly, medicated or hormone supplemented (HC) which the endometrium prepared by exogenous estrogen progesterone following pituit...

OBJECTIVE The number of assisted reproductive technology (ART) clinics, ART cycles, clinical pregnancy rate (CPR), and number of newborns conceived using ART have steadily increased in South Korea. This aim of this study was to describe the status of ART in South Korea between January 1 and December 31, 2011. METHODS A localized online survey was created and sent to all available ART centers ...

BACKGROUND Whether extended culture allowing selection of embryos with high development potential has any advantage over cleavage-stage embryo transfer remains a matter of debate. Among the currently unsolved questions, the cumulative delivery rate resulting from fresh and frozen embryo transfers needs to be taken into account in both strategies. The aim of our study was, therefore, to compare ...

BACKGROUND Polycystic ovary syndrome (PCOS) patients are at increased risk of pregnancy complications, which may impair pregnancy outcome. Transfer of fresh embryos after superovulation may lead to abnormal implantation and placentation and further increase risk for pregnancy loss and complications. Some preliminary data suggest that elective embryo cryopreservation followed by frozen-thawed em...