Almazán Díaz M
Prensa Med Mex. 1979 Jan-Feb;43(1-2):15-21.
The exchange among the elements of amniotic liquid is a dinamic process which keeps stable the concentration of their components, showing a variable relation with the maternal plasma in the differents stages of gestation. Thus the formations of the kidneys modifies the amniotic liquid with the urine excretion and then, factors as swallowing; the secretions of the skin and bronchi are factors which are implicated in its production. The amniocentesis is important in the study of high risk fetus, particulary with a prognostic value in the pregnancy sensitized to the Rh factor. The non cultivated celle give us information about the sexual chromatine and enzymes, to get a quick diagnosis, but this has to be confirmed with a culture cells for a final diagnosis, especially in diseases caused by inborn errors of metabolism.
羊水成分之间的交换是一个动态过程，该过程可保持其成分浓度的稳定，在妊娠的不同阶段与母体血浆呈现出可变的关系。因此，肾脏的形成通过尿液排泄来改变羊水，此外，诸如吞咽等因素；皮肤和支气管的分泌物也是参与羊水产生的因素。羊膜穿刺术在高危胎儿的研究中很重要，特别是在对Rh因子致敏的妊娠中具有预后价值。未经培养的细胞可为我们提供有关性染色质和酶的信息，以进行快速诊断，但这必须通过培养细胞来确诊，尤其是在由先天性代谢缺陷引起的疾病中。
