Birth Defects Testing - Second-Trimester Tests

Screening tests

Diagnostic test

  • AmniocentesisAmniocentesis. Doctors use this test to look for chromosomal problems in the baby's cells. A doctor puts a needle through the belly and into the uterus to collect some of the amniotic fluid that surrounds the baby. This fluid contains some of the baby's cells. The test is done between 15 and 20 weeks of pregnancy, usually around week 16. This test also can help find neural tube defects, such as spina bifida.
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