Genetic Screening Tests for Women 35 or Older
Noninvasive Prenatal Diagnosis
This new blood test, also called cell-free DNA testing, is used to show whether you are at risk for having babies with chromosome problems. Because it's done by using a sample of your blood, it's less invasive than amniocentesis or CVS.
The test finds a baby's DNA floating around in the mother's blood. The result determines the chance that the baby could be born with Down syndrome, trisomy 18, or trisomy 13.
Using this test in twins remains controversial. Ask your doctor or genetic counselor if this test is appropriate for you.