Characteristics of FET and pregnancy outcomes
In FET cycles, except for larger uterine diameter and higher proportion of severe dysmenorrhea in ultra-long protocols, other baseline data of embryos originating COS cycles were similar in ultra-long, long and antagonist protocols. However, baseline differences between short and other protocols still had statistical differences, such as age, AFC and AMH. The pregnancy outcomes of FET indicated that no matter which origin of embryo, IR, CPR, MR and LBR had no statistical difference in FET cycles. So far, there was no other similar comparisons.