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判定胎儿成熟度是围产期监护的一个重要环节。由于羊水成份可以反映胎儿在子宫内的状况,因而羊水成分的检查分析已成为现代产科学研究胎儿成熟度或病态的重要课题之一。羊水检查的生理学基础羊水不是静止不变的,它和胎儿间隙之间有显著的水分和溶质的交换,在妊娠晚期或足月时转换量最大。早孕(12～22孕周)时,羊水从母儿间隙通过胎盘组织层透析出来。妊娠中期以后,胎儿尿是羊水的主要来源。孕后期可有相当量羊水经胎
Determining fetal maturity is an important part of perinatal care. As amniotic fluid components can reflect the status of the fetus in the womb, the amniotic fluid component of the inspection analysis has become the modern obstetrics to study fetal maturity or ill-health one of the important issues. The physiological basis of amniotic fluid amniotic fluid is not static, there is significant water and solute exchange between the fetus and the gap, in the third trimester of pregnancy when the maximum amount of conversion. Early pregnancy (12 to 22 gestational weeks), amniotic fluid from the maternal and child gap through the placental tissue layer dialysis out. After the second trimester, fetal urine is the main source of amniotic fluid. Late pregnancy may have a considerable amount of amniotic fluid through the fetus