Abstract: Retained placenta is one of the most common complications during vaginal delivery. With the release of "three-child policy" in China and the increase of pregnancy at advanced maternal age，the incidence of retained placenta will predictably increase year by year. Strengthening the identification of risk factors and active management of third stage of labor are of great significance to preventing postpartum hemorrhage and reducing maternal mortality.

Key words: retained placenta, vaginal delivery, manual removal of placenta, placenta accreta spectrum

摘要： 胎盘滞留是阴道分娩过程中最常见的并发症之一。随着国家“三孩政策”的放开及高龄孕产妇的增加，胎盘滞留的发生率可预见性地也会逐年上升。加强风险因素的识别，积极处理第三产程对预防产后出血、降低孕产妇死亡率具有重要意义。

关键词: 胎盘滞留, 阴道分娩, 手取胎盘, 胎盘植入性疾病