Background Human chorionic gonadotropin (hCG) as one of the first signals secreted by the
embryo to the mother may have a direct effect on the endometrium at implantation. The …

STUDY QUESTION What is the association between serum progesterone levels on the day
of frozen embryo transfer (FET) and the probability of live birth in women undergoing …

Study question What frozen-thawed embryo transfer (FET) protocol is associated with the
highest live birth rate (LBR)? Summary answer: Natural cycle FET (NC-FET), with or without …

Objective Natural FET studies to date determine the window of receptivity for implantation to
be calculated as either 6 days (d) after a natural LH surge (15IU/L) or 7d after hCG trigger …

Background: Timing of frozen embryo transfer (FET) within a purported window of
implantation is of increasing interest, and there is a paucity of evidence surrounding the …

Abstract Study question Objective: To determine in embryo cryotransfer cycles with hormone
replacement therapy whether progesterone levels five days after transfer< 15.7 ng/mL …

Study question Do obstetric and neonatal outcomes of women who conceived through home-
based monitoring of the ovulation in natural cycle frozen embryo transfer (NC-FET) differ …

Background The number of frozen Embryo transfers (FET) in invitro fertilization cycles (IVF)
cycles is increasing and has already surpassed in numbers of fresh stimulated IVF cycles …

OBJECTIVE To investigate the association between live birth and serum estradiol (E2)
concentration at time of exogenous progesterone (P) start in programmed single frozen …

Study question In a modified natural cycle frozen-thawed embryo transfer (mNC-FET), does
the premature timing of progesterone luteal phase support (LPS) initiation 24 h following …