揭示妊娠妇女微量元素异常是较普遍的现象。
It indicated that the unusual phenomena of trace elements in pregnant women should be paid duly concerns.
结论妊娠期间存在骨密度下降现象，但到产后6周才能检测到定量骨超声指标的变化。
Conclusion During pregnancy, bone mineral density decreased too slowly to be detected, and the changes of quantitative ultrasonic parameters could be detected until 6 weeks postpartum.
结果：2 3例均安全度过妊娠期，顺利分娩，无人工流产现象，婴儿发育正常。
Result:23 cases all survived through pregnant period, without any abortion and infants were normal.
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