Research indicates frozen embryo transfer is associated with a lower risk of ectopic pregnancy
Research by Zhang et al (2017) compared the risk of ectopic pregnancy in fresh and frozen thawed embryo cycles. A retrospective study was conducted and a total of 69, 756 embryo transfer cycles were analysed, including 45, 960 fresh cycles and 23, 796 frozen cycles. Frozen thawed embryo transfer is associated with a lower incidence of ectopic pregnancy per clinical pregnancy. Within frozen thawed embryo transfer cycles, blastocyst transfer shows a significantly lower risk of ectopic pregnancy in comparison with day 3 cleavage embryo transfer.
For more information, please see the Sage Journal article