孕中期指的是孕十四周到孕二十七周末期间。随着早孕反映的消失，很多孕妇的食量明显的加大。孕中期因为胎盘已经形成，胎儿相对进入了比较安全的阶段。
The differences of SF between groups at the second trimester or at the third trimester were significant(P<0.05,P<0.01).
孕中期及孕晚期各组间SF的差异有统计学意义(P<0.05,P<0.01)。
参考来源 - 孕母铁缺乏对新生儿铁水平的影响Methods We collected 101 term placentas and sera from mothers and their newborn infants, 24 aborted first-trimester placentas and sera from those pregnant women, and 11 induced aborted second-trimester placentas and sera from HBsAg carrying pregnant women.
方法 共收集了HBsAg携带孕妇孕早期血清及其人工流产胎盘24例、HBsAg携带孕中期引产妇女血清及其胎盘和胎儿11例、HBsAg携带足月分娩妇女血清及其胎盘和新生儿101例。
参考来源 - 乙肝病毒经胎盘感染致宫内传播的分子流行病学研究·2,447,543篇论文数据，部分数据来源于NoteExpress
乙肝病毒；孕中期；微量元素。
漏误诊共8例，其中孕中期漏误诊2例；
The misdiagnosis has 8 cases, which the second trimester has 2cases;
目的调查两种孕中期唐氏综合征产前筛查方法的一致性。
Objective:To investigate the consistency between two maternal serum screening for Down′s syndrome in the second trimester pregnancy.
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