但绒毛膜绒毛不能够被用于检测开放性神经管缺损。
The chorionic villi cannot be used to test for open neural tube defects.
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。
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.
如果医生没有在你怀孕前期建议你做绒毛膜绒毛样检的话，你现在需要考虑下做个产前检查了。
If your doctor didn't recommend a CVS test in your first trimester you'll need to consider prenatal testing now.
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