BACKGROUND The effect of progesterone elevation (PE) on the day of human chorionic gonadotropin (hCG) administration on the pregnancy outcomes of in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI) cycles is a matter of ongoing debate. The replacement of cleavage-stage embryos with blastocyst-stage embryos for transfer was proposed to avoid the possible impairment of PE in fresh ...

STUDY QUESTION Does prolonged in vitro culture influence newborn birthweight? SUMMARY ANSWER The absolute mean birthweight and gestational age- and gender-adjusted birthweight (Z scores) of singletons born from blastocyst transfer are higher than singletons born from Day 3 transfer. WHAT IS KNOWN ALREADY An increased proportion of large-for-gestational age (LGA) newborns occurs after blasto...

BACKGROUND Embryologists currently face a challenge when counselling patients regarding the stage and the number of embryos to transfer when no top-quality embryos (TQE) are available. METHODS The aim of this study was to evaluate the efficacy of single blastocyst transfer (SBT) in comparison with the transfer of two cleavage-stage embryos in women under 36 years old. A total of 450 women under...

OBJECTIVE To characterize the incidence and risk factors for monochorionic diamniotic(MC-DA) twinning after assisted reproductive technologies (ART). DESIGN Retrospective population-based study. SETTING The study was conducted in China; Department of Reproductive Medicine Center at The First Affiliated Hospital of Anhui Medical University. POPULATION A cohort of 8860 clinical pregnancies ...

BACKGROUND Extended in vitro embryo culture and blastocyst transfer have emerged as essential components of the advanced reproductive technology armamentarium, permitting selection of more advanced embryos considered best suited for transfer. AIM OF STUDY The aim of this study was to compare between cleavage stage and blastocyst stage embryo transfer in patients undergoing intracytoplasmic sp...