摘要目的:探讨产前筛查的孕妇是否必要选择扩展性无创产前检测(expanded non-invasive prenatal testing, NIPT-plus)。方法:对比分析50例孕妇NIPT和NIPT-plus检测的测序数据量、胎儿游离DNA浓度、产前诊断结果和妊娠结局等。结果:NIPT-plus与NIPT相比，胎儿游离DNA浓度相近，测序数据量提高了4.4倍。NIPT能够检测出NIPT-plus提示的4例21-三体、2例18-三体和9例性染色体非整倍体(sex chromosome aneuploidies，SCAs)高风险，漏检1例-18三体，无法检测出罕见染色体非整倍体(rare chromosome aneuploidies，RCAs)和染色体微缺失/重复综合征(microdeletion/microduplication syndrome，MMS)。NIPT-plus对21-三体、18-三体、SCAs、MMS和RCAs的PPVs分别为100%、100%、44.4%、30.4%和0%。NIPT对21-三体、18-三体和SCAs的阳性预测值分别为100%、100%和44.4%。结论:孕妇有必要选择NIPT-plus，以提高常见的染色体三体、SCAs和MMS的检出率，降低出生缺陷率。

abstractsObjective:To explore whether it is necessary to choose NIPT-plus for the prenatal screening of pregnant women.Methods:The results of NIPT and NIPT-plus sequencing data, fetal DNA concentration, prenatal diagnosis and pregnancy outcome of 50 pregnant women were compared.Results:Compared with NIPT, NIPT-plus attained similar fetal DNA concentration and a 4.4-fold increase in sequencing data. NIPT was able to detect 4 cases of 21-trisomy, 2 cases of 18-trisomy, and 9 cases of sex chromosome aneuploidies (SCAs) signaled by NIPT-plus, but missed one 18-trisomy, and failed to detect rare chromosome aneuploidies (RCAs) and microdeletion/microduplication syndromes (MMS). The PPVs of NIPT-plus for 21-trisomy, 18-trisomy, SCAs, MMS and RCAs were 100%, 100%, 44.4%, 30.4% and 0%, respectively. And those of NIPT for 21-trisomy, 18-trisomy, and SCAs were 100%, 100%, and 44.4%, respectively.Conclusion:It is necessary for pregnant women to select NIPT-plus to improve the detection rate of common trisomies, SCAs and disease-specific MMS, therefore reduce the occurrene of birth defect.