AmniocentesisBy Mayo Clinic staff
Original Article: http://www.mayoclinic.com/health/medical/IM00087
Amniocentesis is a prenatal test. During amniocentesis, an ultrasound transducer is used to show a baby's position in the uterus on a monitor. A sample of amniotic fluid, which contains fetal cells and chemicals produced by the baby, is then withdrawn for testing.