The pressure of the amniotic cavity during normal pregnancy was stable, but changed with AFI. 正常妊娠各期羊膜腔内压力为一相对稳定值,但随羊水过多而升高,过少而下降。
In more advanced gestations fetal lung maturity tests may be performed via amniocentesis or on amniotic fluid samples aspirated from the vagina. 随着妊娠继续,可经羊膜腔穿刺或阴道羊水检查了解胎肺成熟度。