方法对2 80例不同孕期的孕妇用超声骨密度测定仪测量跟骨骨密度（BMD） ，同期选择30例正常健康非孕期妇女做对照组。
Methods 280 cases gravidas in different gestation were determined in calcaneum bone density by using the apparatus. 30 cases normal healthy non-pregnant women were selected as the control group.
方法对2 80例不同孕期的孕妇用超声骨密度测定仪测量跟骨骨密度（BMD） ，同期选择30例正常健康非孕期妇女做对照组。
Methods 280 cases gravidas in different gestation were determined in calcaneum bone density by using the apparatus. 30 cases normal healthy non-pregnant women were selected as the control group.
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