Objective The criteria for determining the timing of frozen-thawed embryo transfer (FET) in
natural cycles is conflicting. The objective of this study was to determine which criteria used …

Background There is no consensus on the exact parameters that define the LH surge for
natural cycle frozen-thawed embryo transfers (NC-FET). Accurately determining the LH …

Research question The optimal timing of progesterone use before blastocyst transfer in
frozen-thawed embryo transfer (FET) cycles remains unknown. Does the different timing of …

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 …

Background For ovulatory women, natural cycle frozen embryo transfers (NC-FET) offer a
convenient option for embryo replacement. Transfer timing must optimize synchronization of …

Objective To assess the incidence of P elevation (PE) in natural cycles and evaluate its
effect on frozen–thawed embryo transfer cycles performed in natural cycles (FET-NC). Study …

Background This study evaluated the influence of menstrual cycle length, menstrual cycle
variability and predicted luteal phase length on the success of vitrified-warmed blastocyst …

Objective To compare the reproductive outcomes of frozen–thawed embryo transfer (FET) in
nature cycle utilizing monitoring ovulation regimen (MOR) and monitoring progesterone (P) …

Background: The transfer of cryopreserved embryos can be timed with ovulation in a natural
cycle or after artificially preparing the endometrium with exogenous hormones …

Study question Do serum progesterone or LH levels better predict the optimal timing for
embryo transfer in true natural cycle frozen-thawed embryo transfers (NC-FET)? Summary …