How is the amniotic fluid volume measured?
Amniotic fluid volume can be assessed qualitatively (by an experienced imager) or measured semiquantitatively. For semiquantitative assessment, the amniotic fluid index (AFI) is calculated by individually measuring and then adding together the deepest vertical empty fluid pockets (no umbilical cord or fetal parts) in each quadrant. A normal AFI is between 8 cm and 24 cm, and each individual fluid pocket should be between 2 cm and 8 cm.
