Despite the worldwide increase in frozen embryo transfer, the search for the best protocol to
prime endometrium continues. Well-designed trials comparing various frozen embryo …

BACKGROUND Spontaneous ovulation during a natural menstrual cycle is frequently used
for timing frozen embryo transfer (FET). Nevertheless, it remains unclear whether or not …

Over the past decade, the application of frozen-thawed embryo transfer treatment cycles has
increased substantially. Hormone replacement therapy and the natural cycle are two …

Infertility affects one in six couples, with in vitro fertilization (IVF) offering many the chance of
conception. Compared to the solitary oocyte produced during the natural menstrual cycle …

Importance The necessity of progesterone supplementation for luteal phase support (LPS) in
natural cycle frozen embryo transfer (NC-FET) cycles warrants further confirmation …

Frozen-thawed embryo transfer (FET) has been a viable alternative to fresh embryo transfer
in recent years because of the improvement in vitrification methods. Laboratory-based …

Moderate quality evidence suggests that the administration of progesterone luteal phase
support (LPS) is beneficial in natural and modified (HCG-triggered) natural frozen embryo …

Context Luteal phase support (LPS) has become an essential component of IVF protocols
following both fresh and frozen embryo transfers, yet there is still controversy with regards to …

STUDY QUESTION Is there a circadian variation of serum progesterone (P) on the day of
frozen embryo transfer (FET) in a modified natural cycle (mNC)? SUMMARY ANSWER …

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 …