非整倍体异常是胎儿最常见的一类染色体数目异常,主要包括以下两类:由常染色体数目异常引起的非整倍体(如2 1三体综合征、1 8三体综合征和1 3三体综合征)和由性染色体数目引起的非整倍体(包括X单体如Turner综合征和性染色体三体型如克氏综合征、超雄综合征和超Y综合征)。过去, Aneuploidy abnormalities are the most common type of chromosome abnormalities in the fetus, mainly including the following two categories: aneuploidy caused by the abnormal number of autosomes (such as trisomy 21, trisomy 8 and 1 3 trisomy) and aneuploidy caused by the number of sex chromosomes (including X-monomers such as Turner’s syndrome and trisomy of the sex chromosomes such as Klinefelter’s syndrome, super-hero syndrome, and super-Y syndrome). past,