There are two test options available between the 15th and 18th weeks to screen for chromosomal abnormalities and neural tube defects such as Down's syndrome and spina bifida.

在15周到18周之间有两个极好的检查可以选择来甄别染色体异常和神经管缺损症状，比如：唐氏综合症和脊柱裂。

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"This screening method has the potential to improve birth rates, minimise the incidence of miscarriage and birth defects caused by chromosomal irregularity," Fishel said.

“这种检测的理念有可能提高出生率，最大程度的减小流产和因为染色体不规则而导致的先天性缺陷。”Fishel说。

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Although the carriers of chromosomal balanced translocation have normal phenotypes they would lead to infertility, abortion of fetus, malformation of fetus and congenital defects after born.

染色体平衡易位携带者由于自身染色体是平衡的因此没有异常表型，但将导致不育、流产、死胎、畸胎、胎儿宫内和出生后生长缺陷。

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