Which is better: a fresh or a frozen embryo transfer?

Fresh embryo transfer is the original approach of IVF and allows for immediate transfer of an embryo after fertilization. However, it carries risks of ovarian hyperstimulation syndrome (OHSS) and potential desynchronization of the timing “match” between embryo development and uterine receptivity. Frozen embryo transfer (FET) is currently the most common form of transfer as it eliminates the risk of OHSS and avoids any embryo/uterine synchronization issues (translating to higher success rates). For patients pursuing PGT-A, a frozen transfer is always necessary to allow time for the results of the genetic testing to be completed and inform the embryo selection process.