HLD / TAPD ratio > 0.55 was as screen standard , and the abnormal heart sensitivity was 83.33 % and the specificity was 95.79 % in group II .
以心脏长径与胸腔前后径比值>0.55为标准,筛查Ⅱ组胎儿心脏异常,灵敏度83.33%,特异度95.79%。