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Home Knowledge Center Wellness Library Amniocentesis

Amniocentesis

Amniocentesis is a test to study the liquid (amniotic fluid) that surrounds a baby. Amniotic fluid contains cells and other substances that can give clues about a baby's health. Amniocentesis can be done after about the 15th week of pregnancy, when there is enough amniotic fluid for testing.

Amniocentesis is done by putting a needle through the belly into the uterus. About 2 Tbsp (30 mL) of the amniotic fluid is collected and examined in a lab. The fluid sample can be examined for:

  • Genetic characteristics, such as the sex of the baby.
  • Chromosome problems, such as Down syndrome.
  • Infection.

Levels of certain substances in the fluid sample, such as alpha-fetoprotein, can also be checked. Some abnormal levels may mean there is a problem with the development of the brain and nerves.

Amniocentesis is usually done between weeks 15 and 20 of the pregnancy for genetic testing. It can be done later in pregnancy to check for an infection.

Current as of: April 30, 2024

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

This information does not replace the advice of a doctor. Ignite Healthwise, LLC, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.

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© 2024 Ignite Healthwise, LLC. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Ignite Healthwise, LLC.

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