Introduction
ovulation disorder
PROLIFERATION, IRREGULAR MENSTRUATION
The proportion of frozen embryo transfer (FET) has increased dramatically in recent years. Artificial cycle (AC) is one of the classic schemes for endometrium preparation, owing to its advantages of less monitoring and lower cancellation rate. AC-FET is suitable for women with ovulation disorder, irregular menstruation or those who do not wish to be monitored frequently. During AC-FET, a gonadotropin releasing hormone agonist (GnRH-a) may be used, followed by sequential supplementation with estrogen and progesterone to promote the proliferation and transformation of endometrium (Human chorionic gonadotropin (hCG) is one of the first signals secreted by the embryo to the mother (This prospective RCT aimed to compare the clinical outcomes in AC-FET cycles with and without IM-hCG as luteal phase support at a single center.