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羊水充满了羊膜腔,有保护母体及胎儿的作用,孕期不同,其来源、容量及组成均有变化。妊娠早期主要从母体血清由胎膜滤过而成,中晚期则胎儿尿可能成为主要来源;羊水容量可以在产时或手术时直接测量,但过去产前主要靠临床触诊,凭经验估计,准确性极差。B型超声检查技术(下简称B超)的发展,通过羊膜腔暗区大小的测定,可较准确地了解产前的羊水量,发现异常能及时处理,从而减少围
Amniotic fluid filled with amniotic cavity, there is the role of protection of the mother and the fetus, different during pregnancy, its origin, capacity and composition have changed. The first trimester of pregnancy is mainly from the maternal serum filtered through the fetal membrane, fetal urine in the late may become the main source of amniotic fluid capacity can be measured directly during labor or during operation, but in the past prenatal mainly by clinical palpation, empirically estimated, Accuracy is poor. B-mode ultrasound examination (B referred to as the development), through the determination of the size of the amniotic dark area can be more accurate understanding of prenatal amniotic fluid volume and found that abnormalities can be promptly processed to reduce Wai