Increased progesterone/estradiol ratio in the late follicular phase could be related to low ovarian reserve in in vitro fertilization-embryo transfercycles with a long gonadotropin-releasing hormone agonist protocol

Objective: To gain insight into the physiologic as well as the clinical sig nificance of premature luteinization in the long gonadotropin-releasing hor mone agonist (GnRH-a) cycles and to evaluate whether it may be a manifestat ion of low ovarian reserve. Design: Prospective evaluation. Setting: A university-affiliated reproductive medicine unit. Patient(s): Seventy-six consecutive infertile women. Intervention(s): The long GnRH-a protocol was used for IVF-ET treatment. Main Outcome Measure(s): Women in the study were prospectively evaluated in their first cycle of treatment and were, divided into those with (study gr oup) or without premature luteinization (control group). Premature luteiniz ation was defined as P/E-2 ratio of more than I on the day of hCG administr ation. Result(s): Thirty-one (41%) of the women in the study demonstrated prematur e luteinization. Patients characteristics were comparable between the two g roups. Late follicular P/E-2 ratio was significantly and considerably highe r in the study as compared to the control group, 2.4 +/- 1.7 and 0.7 +/- 0. 2, respectively. Ovarian reserve parameters including day 3 FSH, E-2 level on hCG day, total amount of hMG, number of follicles, oocytes, and embryos were significantly inferior in the study as compared to the control group. P levels on hCG day were significantly higher in the study as compared to t he control group, 1.9 +/- 0.7 ng/mL and 1.2 +/- 0.6 ng/mL, respectively. Ho wever, LH levels on hCG day did not differ between the groups, 1.4 +/- 0.7 mIU/mL and 1.2 +/- 0.7 mIU/mL, respectively. The clinical pregnancy rate wa s significantly lower in the premature luteinization group as opposed to co ntrols, 13% and 42%, respectively. Conclusion(s): Premature luteinization, defined as late follicular P/E-2 >1 , in long GnRH-a cycles seems to adversely affect clinical outcome. Our fin dings in this setting support the notion that premature luteinization could be related to low ovarian reserve and that this manifestation is not neces sarily an LH-dependent event, (C) 2001 by American Society for Reproductive Medicine.