Polyhydramnios is a medical condition describing an excess of amniotic fluid in the amniotic sac. It is seen in about 1% of pregnancies.[1][2][3] It is typically diagnosed when the amniotic fluid index (AFI) is greater than 24 cm.[4][5] There are two clinical varieties of polyhydramnios: chronic polyhydramnios where excess amniotic fluid accumulates gradually, and acute polyhydramnios where excess amniotic fluid collects rapidly.

The opposite to polyhydramnios is oligohydramnios, not enough amniotic fluid.


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