Background Endometrial preparation with hormone replacement therapy (HRT) is the
preferred regimen for clinicians due to the opportunity to schedule the day of embryo transfer …

A retrospective cohort study was performed to examine whether, in artificial endometrial
preparation for frozen embryo transfer (FET) cycles, progesterone (P) levels the day prior to …

Background Previous observational studies have highlighted the negative effects of serum
hormone levels at the minimum threshold during frozen embryo transfer (FET) cycles …

STUDY QUESTION Does an individualised luteal phase support (iLPS), according to serum
progesterone (P4) level the day prior to euploid frozen embryo transfer (FET), improve …

Background Progesterone (P4) is essential for support of the endometrium and implantation
of an embryo in the normal menstrual cycle. In programed frozen embryo transfer cycles …

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 …

Research question What factors determine serum progesterone concentrations the day
before cryopreserved embryo transfer in artificially prepared cycles? Design Retrospective …

Research question Is serum progesterone measurement on the day of embryo transfer
associated with outcome of frozen–thawed embryo transfer (FET) in cycles using hormonal …

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 …

Purpose The purpose of this study is to investigate whether progesterone (P4) levels on the
day of frozen-thawed embryo transfer (FET) to a hormonally prepared endometrium …