Prenatal Tests

If you are 35 or older at the time of delivery, there's a good chance your health care professional will recommend this test, because women over 35 have a higher risk of having a baby with Down's syndrome. It's also recommended if you've already had a child with a birth defect or if you have a family or personal history that puts you at risk for an inherited disease. There are risks to you and your fetus associated with having an amniocentesis. Speak with your health care provider to learn the risks and benefits of getting an amniocentesis.">Amniocentesis A needle is inserted into the amniotic sac and a bit of the amniotic fluid removed and examined. This test can provide information on various chromosomal and genetic abnormalities, including Down syndrome and neural tube defects. After 15 weeks. Performed as an in-office procedure. Ultrasound Sound waves are used to help identify gestational age, detect multiple pregnancies, and identify any structural anomalies. 18 to 20 weeks. Typically performed in the office or in a diagnostic center. Serum marker screening Blood test used to screen for neural tube defects and trisomies 21 and 18. 16 to 18 weeks. Performed in the office.