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目的:分析探讨无创产前检测(non-invasive prenatal testing，NIPT)对于双胎妊娠胎儿非整倍体的检测价值。方法:选取2016年1月至2019年12月在本中心接受NIPT检测的2473例双胎孕妇，利用高通量测序和生物信息学分析测算胎儿染色体非整倍体的风险率，为高风险孕妇提供羊膜腔或绒毛穿刺，并对结果进行随访。结果:在2473例孕妇中，共检出31例(1.25%)胎儿染色体高风险，其中5例为21-三体，1例为21号染色体缺失，4例为18-三体，7例为性染色体异常，14例为微缺失/微重复。经产前诊断或新生儿外周血染色体核型分析，共确诊5例21-三体、3例18-三体，1例性染色体异常，2例微缺失/微重复，其阳性预测值分别为100%、75%、25%和25%。结论:NIPT筛查双胎妊娠胎儿染色体非整倍体的准确性较高，是一种安全有效的筛查手段，对21-三体的筛查效率高于其他染色体。“,”Objective:To asses the value of non-invasive prenatal testing (NIPT) for the detection of fetal chromosomal aneuploidies in women with twin pregnancy.Methods:A total of 2473 women with twin pregnancy underwent the NIPT test to assess the risk for fetal chromosomal aneuploidies from January 2016 to September 2019. Those with a high risk by NIPT were confirmed by amniocentesis or chorionic villus sampling. All cases were followed up to evaluate the positive prediction value of NIPT for twin pregnancies.Results:Among the 2473 women, the NIPT test has identified 31 cases (1.25%) with a high risk for fetal chromosomal aneuploidies, which included 5 cases of trisomy 21, 1 case of chromosome 21 deletion, 4 cases of trisomy 18, 7 cases of sex chromosome abnormality and 14 cases of microdeletion and microduplication. By invasive prenatal diagnosis or chromosomal karyotyping analysis of neonates, 5 cases of trisomy 21, 3 cases of trisomy 18, 1 case of sex chromosome abnormality, and 2 cases of microdeletion and microduplication were confirmed, which yielded a positive predictive value of 100%, 75%, 25% and 25%, respectively.Conclusion:NIPT can be used for the screening of fetal chromosomal aneuploidies in women with twin pregnancy with high accuracy. The method is non-invasive, safe and effective for the screening of fetal chromosomal aneuplodies, in particular trisomy 21.