Healthwise

Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

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.

Due to the threat of the COVID-19 (Coronavirus), we are taking precautionary measures to protect our staff and patients. We are implementing a temporary NO VISITOR policy at this time. Only patients or patients and their guardians will be allowed into the office. Please note, this is not to inconvenience anyone! The virus is a very real threat and it is essential that we stay healthy in order to provide needed care for our patients. If you are sick, we ask that you CALL the office to speak with a nurse before you come in. The nurse will provide specific instructions for you. Please DO NOT enter the office if you are sick (upper respiratory symptoms, fever, cough, or flu like symptoms). We are closely monitoring the situation and will update you as circumstances change. Thank you for your understanding!!