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To determine an optimal serum E 2 level on the day of hCG administration in controlled ovarian hyperstimulation (COH) during IVF-ET without compromising pregnancy outcome.Retrospective study.Large urban medical center.Data of 455 cycles of fresh IVF-ET with COH.Serum E 2 levels on the day of hCG administration were categorized into five groups: group A (<1000 pg/mL), group B (1000–2000...