该检查采用最先进的DNA技术检查母亲血液中的遗传物质，以判断胎儿是否患有唐氏综合症。
The test USES the latest DNA technology to analyse genetic components in the mother's blood that indicate whether the foetus has Down's.
绒毛取样需要从胚胎中取出遗传物质样本，有百分之一的可能导致流产，所以一般只有在胎儿患病风险很高的情况下才会使用。
The latter tests take samples of genetic material from the foetus but they carry a 1% risk of miscarriage and are therefore reserved for high risk pregnancies.
绒毛取样需要从胚胎中取出遗传物质样本，有百分之一的可能导致流产，所以一般只有在胎儿患病风险很高的情况下才会使用。
The latter tests take samples of genetic material from the foetus but they carry a 1% risk of miscarriage and are therefore reserved for high risk pregnancies.
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