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To evaluate the diagnostic performance of the antimüllerian hormone (AMH) level determined using the Access AMH assay for predicting poor ovarian response (POR) defined as ≤4 oocytes retrieved, including the validation of the predefined AMH cutoff of 0.93 ng/mL in both serum and plasma. Prospective cohort study. Fifteen private and academic fertility centers (14 in the United States and 1 in Canada). Women aged 21-45 years planning controlled ovarian stimulation for invitro fertilization. None. Number of oocytes retrieved, categorized as