在产前诊断中,二倍体/四倍体(简称2n/4n)嵌合体容易漏诊。有人认为只有当多倍体细胞超过所分析细胞的10%时,2n/4n才能被诊断。在羊水培养中,四倍体细胞的出现最为普遍,其出现比率有时可达83%,但以后可生下核型正常的孩子。由此可见,2n/4n嵌合体在产前 In prenatal diagnosis, diploid / tetraploid (referred to as 2n / 4n) chimera easily missed diagnosis. It is thought that 2n / 4n will be diagnosed only when polyploid cells exceed 10% of the cells analyzed. In amniotic fluid culture, the appearance of tetraploid cells is the most common, the rate of occurrence of up to 83% sometimes, but later gave birth to children with normal karyotype. Thus, 2n / 4n chimera in prenatal