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妊娠
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孕妇：可能的症状与妊娠综合征：产前检查
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羊水诊断
羊水诊断是产前检查的项目之一，检查中用一根细而长的针头经孕妇腹腔刺入，提取羊水样本。羊水乃胎儿漂浮的液体。为了探测胎儿严重的畸形，羊水诊断通常在妊娠第16-18周进行。
通常只有在样本提取后的3-4周后才能够获得结论（胎儿的某些发育畸形结果可能较早获得）。因为羊水诊断的副作用是有轻度的流产风险，孕妇和医生在胎儿出身之前，必须对此项检查的流产风险和获取胎儿可能的遗传性疾病信息作出细致的权衡，以确定是否有必要冒此风险。如果发现了胎儿有遗传性疾病，则必须作出另外的抉择：应该考虑做流产手术来终止此后的妊娠吗？ |
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Pregnancy
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The Woman During Pregnancy: Possible Problems and
Complications:
Prenatal Tests
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Amniocentesis
Amniocentesis is a procedure in which a long, thin needle is inserted through the woman’s abdomen to sample the amniotic fluid in which the fetus swims. It is usually performed 16 -18 weeks into the pregnancy in order to detect serious abnormalities in the fetus.
The results are usually available only after 3-4 weeks (for some problems earlier results are possible). Since there is a small risk of miscarriage as a result of the procedure, the woman and her doctor must weigh this risk against the benefits of learning about a genetic disorder in the fetus well before it is born. If such a disorder is found, another decision has to be made: Should an abortion be considered this late in the pregnancy? |
