Towards a more sustainable balance between optimal live birth rate and supernumerary embryos in ART treatments.

Purpose: To assess the relation between number of inseminated oocytes and cumulative live birth rate (CLBR) in order to provide guidance for limiting the number of surplus blastocysts.

Methods: The study was a retrospective, single-center cohort analysis of 1223 ART complete cycles. Cycles were stratified according to female age (≤ 34, 35-38, and 39-42 years) and number of inseminated oocytes (1-5, 6-10, and > 10).