Controlled ovarian hyperstimulation. Relationship of early serum E2 levels to the ultimate response of oocyte donors.

OBJECTIVE: To assess the predictive value of measuring serum day 5 E 2 and in vitro fertilization (IVF) cycle outcome of oocyte donors undergoing controlled ovarian hyperstimulation (COH). STUDY DESIGN: Retrospective data analysis. RESULTS: Day 5 E 2 significantly correlated with the peak serum E 2 and number of retrieved mature oocytes. The pregnancy rates associated with stimulated day 5 E 2 > 70 pg/mL were significantly greater than in cycles with levels < 70 pg/mL (58%, 71/123, versus 25%, 15/60; P <.05). CONCLUSION: The cycle performance of an oocyte donor can be predicted by measuring cycle day 5 serum E 2 during COH. Poor-prognosis cycles can be identified and discontinued, saving patients and the program unnecessary espense.