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A member asked:
What can you do to detect trisomy with prenatal testing?
9 doctors weighed in across 2 answers
CVS or amniocentesis: Trisomies can be detected with chorionic villi sampling (cvs) or amniocentesis. Cvs is performed between 10-13 weeks, and involves removing a small sample of the placenta usually using a small tube, or catheter that is inserted through the cervix. Amniocentesis is performed between 15-20 weeks gestation and is a procedure where amniotic fluid is removed from around the fetus using a needle.
Answered 7/8/2015
5.8k views
Invasive/non-invasiv: Traditional invasive prenatal diagnosis involves amniocentesis or placental biopsy/chorionic villus sampling. Recent technology allows the analysis of fetal dna in the maternal blood without risks to the pregnancy (maternit21, other tests now available). Screening prenatal ultrasound can also give hints of trisomy, but is not diagnostic in and of itself.
Answered 11/27/2017
5.7k views
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