Antenatal diagnosis by Chorionic villus sampling can be done.

产前诊断由绒毛采样是可以做到的。

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A chorionic villus is a minute vascular projection on the fetal chorion.

绒膜绒毛是胎儿绒毛膜上的一种微小的血管凸出物。

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Examples of diagnostic tests include amniocentesis and chorionic villus sampling.

的例子，诊断测试，包括羊膜穿刺术和绒毛取样。

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Some research suggests that the miscarriage rate following chorionic villus sampling may be as high as 2%, the researchers said, which, if true, would raise that toll closer to 600.

BBC: Down's test miscarriage warning

To confirm or rule it out, a further test is offered - either amniocentesis and chorionic villus sampling, both of which use a fine needle to take tissue or fluid from inside the womb.

BBC: Down's test miscarriage warning

However, the researchers said that despite a lower number of invasive tests, the heavier reliance of this method on chorionic villus sampling earlier in pregnancy could actually mean an increase in the number of healthy babies lost if the miscarriage rate using this method was closer to 2%.

BBC: Down's test miscarriage warning