Results Nine cases of trisomy 18 and 2 cases of other abnormal karyotype were found among the 128 pregnant women (8.59%, 11/128).

结果128例胎儿核型中，9例为18三体综合征，2例为其它染色体异常，染色体异常发现率为8·59%（11/128）。

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Objective: To determine the rate of prenatal detection of ultrasonography abnormalities in fetuses with trisomy 18 and evaluate its predictive value.

目的：探讨孕期18 -三体胎儿超声异常的产前检出率及临床价值。

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CONCLUSIONS: The extent to which free fetal DNA testing can be applied as a universal screening tool for trisomy 21, 18, and 13 depends mainly on assay accuracy and cost.

结论：胎儿游离dna检测作为21三体、18三体和13三体的通用筛查工具的程度，主要取决于测定方法的准确性和成本。

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In her lab, Dr. Cherry said she had found four out of six positive results for Trisomy 18, or Edwards syndrome, which the tests also detect, appeared to be false alarms after follow-up testing.

WSJ: New Questions on Cutting-Edge Prenatal Tests