In assisted reproductive technology, the timing of embryo transfer after oocyte retrieval and in vitro fertilisation is crucial. While traditionally embryos have been transferred at the cleavage stage, transferring them at the blastocyst stage is becoming more common. A study by Cornelisse and colleagues compared outcomes of embryo transfers on day 3 or day 5, looking at both fresh and frozen transfers. The study found no difference in cumulative live birth rates. This research is valuable as it considers the potential of surplus frozen embryos and explores the impact of transfer stage on obstetric and neonatal outcomes, providing important insights for women and clinicians making reproductive decisions.
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Timing embryo transfers during assisted reproduction
