方法：采用现场调查、专家咨询、专题组座谈和个人深入访谈，对唐氏综合征产前诊断项目的标准成本进行测算。
Methods: Field survey, experts counseling and focus group interviews were employed to collect data and calculate standard cost of diagnosis of Down's Syndrome.
结论孕妇血清风险评估结合彩超诊断对孕早、中期唐氏综合征筛查有重要的意义。
Conclusion Serum marks with CDFI may play an important role in screening for Down's syndrome at early and mid pregnancy.
阿颈背扫描是扫描超声产前筛查(超声波)，以帮助确定风险较高的唐氏综合征胎儿中，特别是对老年妇女有较高的风险，谁这样怀孕。
A nuchal scan is a sonographic prenatal screening scan (ultrasound) to help identify higher risks of Down syndrome in a fetus, particularly for older women who have higher risks of such pregnancies.
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