The impact of an increased progesterone-to-follicle number ratio on live delivery rates in women with normal ovarian reserve.

<bold>Objective: </bold>To explore the relationship between progesterone-follicle number (P/F) ratio and live delivery rate in patients with normal ovarian reserve undergoing cleavage-stage embryo transfer with a long gonadotropin-releasing hormone agonist cycle.<bold>Methods: </bold>The present retrospective study included data from patients younger than 38 years with normal ovarian reserve who were undergoing in vitro fertilization/intracytoplasmic sperm injection and embryo transfer at Zhongnan Hospital, Wuhan University, China, between January 1, 2009 and December 31, 2015. Patients underwent cleavage-stage fresh embryo transfer with a long gonadotropin-releasing hormone agonist cycle, and associations between P/F ratios and fertility/pregnancy outcomes were analyzed.<bold>Results: </bold>Patients with a P/F ratio of 0.11 or above had higher serum progesterone levels (P<0.001) and lower serum estradiol levels (P<0.001) on the day of human chorionic gonadotropin administration in comparison with patients with lower P/F ratios; elevated P/F ratios were also associated with fewer follicles at least 14 mm in size (P<0.001) and lower live delivery rates (P<0.001). Multiple logistic regression confirmed that P/F ratio was an independent predictor of live delivery rate (P=0.001).<bold>Conclusion: </bold>A P/F ratio of at least 0.11 was associated with lower live delivery rates in women with normal ovarian reserve undergoing cleavage-stage embryo transfer with a long gonadotropin-releasing hormone agonist cycle. [ABSTRACT FROM AUTHOR]