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B型超声检测羊水量及胎盘,在孕期管理中是不可缺少的。 羊水量异常的测量有剖宫产时测量羊水量的直接法,和将标志物注入羊水中测其稀释度的间接法。B超测量虽缺乏准确性,但无创伤且能反复测量而广泛用于临床,方法有测量羊水深度(测量单一最大羊水暗区垂直深度)和羊水指数(AFI,将腹分为4部分测定各象限最大羊水暗区值相加)两种。
B-type ultrasound in the detection of amniotic fluid volume and placenta, pregnancy management is indispensable. Abnormal amniotic fluid measurement of cesarean section when measuring the amount of amniotic fluid direct method, and the marker into the amniotic fluid to measure the dilution of the indirect method. Although the lack of accuracy of B-measurement, but noninvasive and can be repeatedly measured and widely used in clinical practice, the method of measurement of amniotic fluid depth (single maximum depth of measurement of amniotic fluid vertical depth) and amniotic fluid index (AFI, the abdomen is divided into four parts of each Quadrant maximum amniotic fluid dark area value addition) two.