Consequently , an excess number of otherwise normal pregnancies would be recommended to undergo definitive testing to ensure as many downs syndrome fetuses could be detected prenatally . however , conventional definitive genetic testing employs invasive methods , such as amniocentesis to obtain fetal tissue for testing , thus carrying a risk to the fetus 但传统的基因测试，例如羊膜穿刺术（俗称抽羊胎水）属入侵性诊断方法，即是要用针穿过母体进入子宫，抽取胎儿细胞，会为孕妇带来一定的风险（例如流产） 。
The spokesman pointed out that should the applicant or his claimed parents refuse to undergo the genetic test , the immigration department will request the applicant to give his reason of refusal in writing . the director may draw any inference from the failure of an applicant or the claimed parents to undergo the genetic test as he considers proper and determine the application accordingly 发言人指出，如申请人或其声称的父母拒绝接受基因测试，入境处会请申请人以书面说明理由。入境处处长可从申请人及其声称的父母没有接受基因测试一事，得出他认为恰当的推论，及据此而决定居留权证明书的申请。
Through genetic screening , we can make much earlier diagnosis in some cases and the chance of preserving eye sight is therefore much better . " a cheque presentation ceremony and naming ceremony of the lim por - yen eye genetics research centre took place today . mr . lim por - yen presented the donation to cuhk in person 基因测试可以让我们找出高危一族，为他们作定期的检查和跟进，即使不幸病发，也能及早发现及加以治疗，所谓病向浅中医，尽早治疗青光眼，可以减少对视神经造成的损害，大大提高整体的疗效。
