Effect of Long-Term Embryo Cryopreservation on Subsequent Frozen Embryo Transfer Outcomes: A Retrospective Cohort Study.

Background: The duration of cryopreservation of embryos and its effect on the subsequent pregnancy outcomes, when they have been frozen for a longer duration remains a matter of concern. There is a continuous debate among studies comparing different durations of embryo cryopreservation as the results are contradictory.

Aims: This study aims to find out if long-term cryopreservation of embryos has any effect on pregnancy and perinatal outcomes.