What you should know: About 15% of all test results are deemed abnormal. Approximately 85% of women with elevated blood sugar is elevated in the screening test.
Amniocentesis
What is it: Screens for down syndrome, trisomy 18, and other chromosome abnormalities, while used to show the baby’s gender.
When is it given: Weeks 15-18
How is the test performed: A long, thin needle is inserted through your abdomen into the sac around your baby to withdraw a sample of amniotic fluid.
What you should know: Amniocentesis is offered starting at age 35, which is when the risk for Down syndrome is equal to the risk of miscarriage from the test. To minimize risk, have it performed by a physician experienced in the procedure.