ABSTRACT
Polyhydramnios is caused by reduced fetal swallowing, or increased fetal urine production. This occurs in 0.5-1% of pregnancies. The diagnosis is usually made subjectively, but it is defined as an amniotic fluid index (AFI) of more than 24 cm or a deepest single pocket measurement of fluid of at least 8 cm. If the deepest pool is greater than 11 cm it is termed moderate, and if more than 15 cm, severe polyhydramnios.
