Prenatal diagnosis for Down syndrome are chorionic villus sampling (CVS), amniocentesis,
and percutaneous umbilical blood sampling (PUBS).
Chorionic villus sampling (CVS) is a procedure which tissue is extracted from the placenta to examine the fetus's chromosomes.
CVS is usually performed between 8-12 weeks of gestation. |
Amniocentesis is a procedure which amniotic fluid is drawn to examine the fetus's chromosomes.
Amniocentesis is usually performed between 16-20 weeks of gestation. |
Percutaneous umbilical blood sampling (PUBS) is a procedure which blood from umbilical vein is drawn to examine the fetus's chromosomes.
PUBS is usually performed when gestation age is over 24 weeks. |
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