The next step in improving the current test will include analysis of DNA from direct chorionic villus sampling or amniotic fluid to further reduce the TAT.

接下来，进一步减少TAT的改进措施包括从绒毛膜绒毛或羊水直接取样用于DNA分析。

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Methods 104 chorionic tissue and 494 amniotic fluid were determind by ELISA and mouse inoculation methods.

方法用ELISA法和小白鼠腹腔培养法，对104份绒毛和494份羊水进行了检测。

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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