This document discusses disorders of amniotic fluid, specifically oligohydramnios. It defines oligohydramnios as amniotic fluid volume less than the 5th percentile for gestational age or an amniotic fluid index less than 5. The incidence is 0.5-5% and causes can be fetal, maternal, or placental in nature. Diagnosis is made through ultrasound measurement of the amniotic fluid index or single vertical pocket. Management depends on the cause, gestational age, and fetal status, and may include hydration, monitoring with serial ultrasounds, induction of labor or C-section, and amniotic fluid replacement through amnioinfusion in some cases.