Amniotic fluid is seldom considered important until polyhydramnios or oligohydramnios occurs, either of which may significantly impact perinatal survival. Amniotic fluid is dynamic, with large volume flows into and out of the amniotic compartment each day. This document explores what is known about the normal mechanisms affecting the formation and removal of amniotic fluid, including fetal urination, swallowing, lung liquid and intramembranous absorption. In addition, the changes in amniotic fluid volume and composition across gestation, in order to help us understand its normal regulation are examined. The various treatment options available for amniotic fluid volume abnormalities are discussed. The goal of this review is to offer the reader a complete understanding of the known mechanisms and functioning of amniotic fluid volume regulation, and their connection with disease states.Read More