Amniocentesis is a procedure used to take out a small sample of the amniotic fluid for testing. This is the fluid that surrounds the fetus in a pregnant woman. Amniotic fluid is a clear, pale yellow fluid that: Protects the fetus from injury. Protects against infection.
The most common reason to have an amniocentesis performed is to determine whether a fetus has certain genetic disorders or a chromosomal abnormality, such as Down syndrome. Amniocentesis (or another procedure.
An amniocentesis is offered to women between the 15th and 20th weeks of pregnancy who are at greater risk for birth defects. It may also be used to follow-up when an earlier test suggests a problem.
Amniotic fluid also contains other substances that give information about the fetus. This procedure may be done in late pregnancy to check fetal well-being and diagnose fetal health problems, such as infection. If a baby is expected to be delivered early, amniocentesis may be done to check for fetal lung maturity.
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