Objective:To investigate the gestational diabetes mellitus(GDM)during early pregnancy, the scope of screening, the diagnosis prognosis and its significance.
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结论孕早期超声筛查能早期检出部分严重、早发的胎儿异常，但不能替代孕中期超声筛查。
Conclusion Ultrasound screening in the first trimester can effectively detect the abnormal fetuses in some degree, but the second trimester screening is still necessary.
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