Module 14 - Amniotic Fluid Flashcards
Amniotic fluid is produced by the chorion frondosum, membranes, skin of the fetus as well as the GU tract & lungs
First trimester
Amniotic fluid produced primarily by the kidneys and a small amount by the lungs
Second and third trimester
Amniotic fluid produced mostly from the chorioamnionic membranes
Early pregnancy
When do the fetal kidneys begin to produce urine?
~11 weeks
High GI obstruction causes?
Polyhydramnios
Bilateral GU obstruction or renal agenesis causes?
Oligohydramnios
Deepest pocket of amniotic fluid >8cm
Polyhydramnios
Normal AFI
5-25cm
When is max amniotic fluid reached and maintained until?
22 weeks - 34 weeks
Most common maternal cause of polyhydramnios
Diabetes mellitus
AFI <5cm
Largest pocket <2x2cm
Oligohydramnios
Limb anomalies, pulmonary hypoplasia, restricted growth
Outcomes of oligohydramnios