However, conventional methods of obtaining fetal tissues for genetic analysis, including amniocentesis and chorionic villus sampling, are invasive and constitute a finite risk to the unborn fetus.

然而，常规的获得遗传学分析的胎儿组织的方法是有创伤的并且是对胎儿有一定的风险，这些方法包括羊膜腔穿刺和绒毛活检被称为侵入性产前诊断。