Prenatal diagnosis is making a diagnosis before birth. Methods for prenatal diagnosis include ultrasound of the uterus, placenta and the developing foetus. Chorionic villus sampling (CVS) involves getting a sample of the placental tissue, known as chorionic villus. This is tested for chromosomal or genetic disorders. Amniocentesis is used to obtain amniotic fluid from the amnion (amniotic sac) surrounding the developing foetus. This fluid enables chromosomes and enzymes to be tested for genetic and other abnormalities. A growing number of birth defects and diseases can be diagnosed prenatally, and in some cases may be treated before birth.
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