061554早产的定义和分类/徐志红…∥实用妇产科杂志·—2005,21(11)·—643~6441961年世界卫生组织规定的早产孕龄标准是妊娠周数37周分娩者定为早产,但没有规定低限。目前我国将早产定义为自末次月经第1日计算,妊娠满28周37周分娩者。早产分类:根据孕龄分为3类:①发生在妊娠 061554 Definition and classification of preterm delivery / Xu Zhihong ... ∥ Practical Obstetrics and Gynecology · 2005, 21 (11) · - 643 ~ 6441961 The WHO standard for gestational age at pre-term pregnancy is 37 weeks gestational age delivery was defined as premature delivery, But there is no minimum limit. At present, China defines preterm birth as calculated from the first day of the last menstrual period, and 37 weeks of pregnancy with delivery of 37 weeks. Preterm birth Category: According to gestational age is divided into three categories: ① occurred in pregnancy