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遗传性疾病产前诊断的一种方法是取出部分孕体行染色体或生化分析。如果诊断结果正常,则允许剩余部分继续发育。如在妊娠中期可借助胎儿镜抽取胎儿血液或行羊膜腔穿刺以得到羊水细胞进行诊断。由于终止中期妊娠比较复杂,对病人及其家属以及对医护人员均增加负担,因此如能在妊娠的早期采用诊断方法将是更可取的。现在有些疾病在孕8～12周通过宫颈获取绒毛标本可作诊断,如证实胚胎不正常,在妊娠3个月之前即能被终止。是否可以在妊娠的更早期如孕卵植入前进行产前诊断?这需在体外处理孕体,然后移入母体子宫内,而在活体内进行这么早期的产前诊断是不可能的,如所采用的诊断程序比孕体在培养基内维持安全生长的时间长,就需将孕体冷冻贮存,直到得知试验结
One method of prenatal diagnosis of hereditary diseases is to take out some of the maternal chromosomes or biochemical analyzes. If the diagnosis is normal, allow the remainder to continue developing. As in the second trimester with fetus fetus fetus fetus fetus blood or amniocentesis to get amniotic fluid cells for diagnosis. Since termination of the second trimester pregnancy is more complex and burdens both the patient and his or her family and the health care provider, it would be preferable to have a diagnostic method early in pregnancy. Now some diseases in the 8 to 12 weeks of pregnancy through the cervix to obtain villus specimens can be diagnosed, as confirmed abnormal embryos, 3 months before pregnancy can be terminated. Is it possible to make a prenatal diagnosis earlier in pregnancy, such as prenatal implantation? This requires treatment of the pregnant body in vitro and then into the mother’s uterus, and such an early prenatal diagnosis is not possible in vivo, Diagnostic procedures used than the pregnant body in the medium to maintain safe growth of a long time, you need to be frozen in the body until the test knot that