Conclusion Ultrasound screening in the first trimester can effectively detect the abnormal fetuses in some degree, but the second trimester screening is still necessary.
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.
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。
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