绒毛活检是一种产前检查，用来检测是否有如唐氏综合征那样的染色体异常疾病。
有时候这是一个CVS早期检查或者叫作绒毛活检，从胎盘处获取绒毛组织。
Sometimes it's an earlier test called CVS, or chorionic villus sampling, which collects a bit of tissue from the placenta.
有些专家认为这项血液试验经过进一步的微调改进，大有可能取代羊膜穿刺或是CVS绒毛活检。
And some suggest that with further fine-tuning, it could largely replace amnio and CVS.
各家公司争相向市场推出了比目前的唐氏检查更准确地血液试验，这可以让孕妇们省去羊膜穿刺或是CVS绒毛活检的需要。
Companies are racing to market a more accurate blood test than those available now that could spare many women the need for an amnio or CVS.
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