Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction 1 article published in JoVE Medicine OP-IVM: Combining In vitro Maturation after Oocyte Retrieval with Gynecological Surgery Tao Liu*1,2,3,4,5, Xueling Song*1,2,3,4,5, Xiaoying Zheng*1,2,3,4,5, Liying Yan1,2,3,4,5, Caihong Ma1,2,3,5, Rong Li1,2,3,4,5, Jie Yan1,2,3,4,5, Jie Qiao1,2,3,4,5 1Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, 2National Clinical Research Center for Obstetrics and Gynecology, 3Key Laboratory of Assisted Reproduction, Ministry of Education, 4Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, 5Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences In vitro maturation (IVM) before gynecological operation (OP-IVM) combines IVM following oocyte retrieval with routine gynecological surgery and serves as an extension of conventional IVM applications for fertility preservation.