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目的:通过分析产前性染色体非整倍体(sex chromosome aneuploidy, SCA)胎儿的产前诊断指征、核型结果、超声表现、妊娠选择以及跟踪随访，探讨SCA的产前临床特征及影响其妊娠选择的相关因素。方法:对2015年1月至2020年2月在本院进行无创产前筛查(non-invasive prenatal testing, NIPT )的孕早中期孕妇并经产前诊断确诊的225例SCA患者进行回顾性分析。结果:225例SCA中，37例45，X、74例47，XXY、50例47，XXX、56例47，XYY和8例嵌合体；33例(24例45，X、3例47，XXY、1例47，XXX、2例47，XYY和3例嵌合体)产前诊断前或后检出胎儿超声异常；121例(53.8%)选择了终止妊娠(31例45，X、61例47，XXY、14例47，XXX、12例47，XYY和3例嵌合体)，104例(46.2%)选择继续妊娠的病例中3例(2例45，X和1例47，XXX)因超声异常选择终止妊娠、2例(1例45，X和1例47，XXY)孕期自发流产。结论:NIPT能有效筛检出SCA病例，SCA病例主要来自产前诊断指征为低风险孕妇。45，X相较于其他类型SCA病例在产检前或后表现超声异常特征。妊娠45，X和47，XXY相较于47，XXX和47，XYY孕妇更倾向于选择终止妊娠。SCA的类型和超声结果是影响孕妇妊娠选择的主要因素。“,”Objective:To analyze the indication, karyotyping result, ultrasound finding, pregnancy decision and follow-up of fetuses with sex chromosome aneuploidies (SCA) detected by non-invasive prenatal testing (NIPT) during early and midterm pregnancies.Methods:The results of 225 singleton pregnancies with fetal SCA detected by NIPT were reviewed and analyzed.Results:The 225 cases included 45, X(n n=37), 47, XXY(n n=74), 47, XXX(n n=50), 47, XYY(n n=56) and mosaicisms(n n=8), among which 121 (53.8%) have opted to terminate the pregnancy, including 45, X(n n=31), 47, XXY(n n=61), 47, XXX(n n=14), 47, XYY(n n=12) and 3 mosaicisms. The remainder 104 (46.2%) elected to continue with the pregnancy, among which three have opted to terminate due to abnormalities detected by ultrasonography, and two had spontaneous abortions.n Conclusion:NIPT as a first-tier screening method can effectively detect fetal trisomies 21, 13 and 18 as well as SCA. The types of fetal SCA and presence of ultrasound abnormalities are critical factors for the termination of pregnancy.