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目的：探讨胎盘分级与胎盘功能和胎儿预后的关系。方法：应用超声将７５４３例Ⅲ级胎盘再分为三个亚型；Ⅲ－、Ⅲ°、Ⅲ＋。结果：胎盘功能和胎儿预后与胎盘类型密切相关，Ⅲ－型：胎盘开始成熟、功能良好；Ⅲ°型：胎盘已经成熟、功能尚可；Ⅲ＋型：胎盘过熟老化、功能减退，若继续妊娠对胎儿不利。结论：Ⅲ级胎盘再分型有助于判断胎盘的生理病理状况，对指导分娩有重要临床价值
Objective: To investigate the relationship between placental grading and placental function and fetal prognosis. Methods: 7543 cases of grade Ⅲ placenta were subdivided into three subtypes by ultrasonography; Ⅲ-, Ⅲ °, Ⅲ +. Results: Placental function and fetal prognosis were closely related to the type of placenta. Type Ⅲ-placenta began to mature and functioned well. Type Ⅲ: placenta was mature and its function was acceptable. Type Ⅲ +: placental over aging and hypofunction, Adverse to the fetus. Conclusion: The re-classification of grade Ⅲ placenta helps to determine the physiological and pathological conditions of the placenta and has important clinical value in guiding the delivery