Amniocentesis results are accurate 99.9% of the time. Amniocentesis is associated with a small risk of miscarriage (approximately 0.5%). An amniocentesis is usually performed around or after the 16th week of pregnancy. The fluid is then sent to the laboratory to test the chromosomes. Amniocentesis (Amnio Test): Procedure that withdraws a small amount of the amniotic fluid that surrounds the fetus.CVS results are accurate approximately 98% of the time. CVS is associated with a small risk of miscarriage (approximately 1%). CVS is typically performed between 10 and 12 weeks of pregnancy. The tissue is then sent to a laboratory to test the chromosomes. Chorionic villi sampling (CVS): Procedure that takes a small amount of tissue from the developing placenta.Your healthcare provider may offer you one of the following follow-up diagnostic procedures to confirm: This means fewer than 1 in 1,000 Harmony tests yields a false-positive result. Harmony has a less than 0.1% false-positive rate for trisomies 21, 18 and 13. If the Harmony prenatal test shows you are high risk, it does not necessarily mean that the pregnancy has one of these genetic conditions. With traditional screening, as many as 1 in 20 women will receive a false-positive result. Traditional screening tests (maternal serum screening, first trimester screening, Quad screening) can miss as many as 20% of Trisomy 21 cases in pregnant women.
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