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 …

STUDY QUESTION Does the endometrial preparation protocol (artificial cycle (AC) vs
natural cycle (NC) vs stimulated cycle (SC)) impact the risk of early pregnancy loss and live …

The use of frozen embryo transfer cycles has exponentially increased in the last few years.
Optimization of endometrial preparation protocols before frozen embryo transfer is …

Progesterone plays a key role in implantation. Several studies reported that lower luteal
progesterone levels might be related to decreased chances of pregnancy. This systematic …

STUDY QUESTION What are the plasma concentrations of dydrogesterone (DYD) and its
metabolite, 20α-dihydrodydrogesterone (DHD), measured on day of embryo transfer (ET) in …

Over the past decade, the use of frozen-thawed embryo transfer (FET) treatment cycles has
increased substantially. The artificial ('programmed') cycle regimen, which suppresses …

STUDY QUESTION Which factors are associated with low serum progesterone (P) levels on
the day of frozen embryo transfer (FET), in HRT cycles? SUMMARY ANSWER BMI, parity …

Research question Will luteal phase rescue with additional progesterone increase serum
progesterone concentrations and improve reproductive outcomes in patients with low serum …

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 …

Research question Does serum progesterone concentration vary on the day of embryo
transfer according to female body mass index (BMI)? Design Retrospective analysis …