Objective To observe the fetus nucleated red blood cell ( NRBC) count changes in the peripheral blood of pregnant women and to investigate its application in prediction of adverse pregnancy outcomes. Methods Blood samples were obtained from 87 pregnant women with the gestational age from 12 to 18 weeks, peripheral blood mononuclear cells were isolated by density gradient centrifugation and then we analyzed the cells marked with PE-GPA/FITC-CD71 mono-clonal antibodies on the flow cytometer. Tracking the pregnancy outcomes, and their correlation between fetus nucleated red blood cell measurement and adverse pregnancy outcomes was analyzed. Results The percentage of fetus NRBC in women with normal pregnancy outcomes was 0. 89% ± 0. 81%, 3. 25% ± 2. 98% in women with adverse pregnancy outcomes, and there was a significant difference between these two groups(P<0. 05). We took fetus NRBC percentage >3. 79% as the cutoff value to predict adverse outcomes of pregnancy, the sensitivity was 76. 9%, and the specificity was 64. 3%. Conclu-sions Compared with women with normal pregnancy outcomes, women with adverse pregnancy outcomes have a higher a-mount of fetus NRBC in the peripheral blood during the gestational age of 12-18 weeks. Measurement of fetus NRBC in ma-ternal peripheral blood has a predictive role in adverse pregnancy outcomes, with a higher sensitivity and specificity.%目的：观察孕妇外周血胎儿有核红细胞计数的变化,探讨其在妊娠不良结局预测中的应用价值。方法收集87例孕12~18周孕妇的外周血,密度梯度离心法分离单个核细胞,采用PE-GPA /FITC-CD71单克隆抗体双色标记胎儿有核红细胞后进行流式细胞分析,追踪妊娠结局并进行分析。结果妊娠结局正常者外周血中胎儿有核红细胞百分比为0.89%±0.81%,妊娠结局不良者为3.25%±2.98%,两者相比,P<0.05。以胎儿有核红细胞百分比>3.79%作为截断值,预测妊娠不良结局的敏感度为76.9%、特异度为64.3%。结论与妊娠结局正常的孕妇相比,妊娠结局不良孕妇孕12~18周时外周血胎儿有核红细胞增多；对孕12~18周孕妇外周血胎儿有核红细胞进行计数有助于不良妊娠结局的预测,其敏感度及特异度均较高。
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