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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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.

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方法：回顾性分析31例正常压力脑积水（NPH）患者临床症状、病程、年龄、腰椎穿刺放液试验等因素对脑室-腹腔分流术的影响及预后效果。

Methods: The efficacy of shunting was retrospectively analyzed according to 31 NPH patients′ symptoms, medical history, age and test of draining cerebrospinal fluid(CSF) with lumbar puncture.

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