Intramuscular route of progesterone administration increases pregnancy rates during non-downregulated frozen embryo transfer cycles

摘要

ObjectiveThe optimal route of progesterone (P4) administration in embryo transfer (FET) cycles remains to be determined. The objective of this study is to compare the pregnancy outcomes between intramuscular (IM) and vaginal progesterone (PV) administration for endometrial preparation in non-donor FET cycles.