Amniocentesis is a medical procedure used for prenatal diagnosis, in which a small amount of amniotic fluid is extracted from the amnion around a developing fetus.

Amniocentesis can be done as soon as there is enough amniotic fluid surrounding the fetus that a sample can be removed safely. This is usually at about 14 weeks gestation, and is usually performed up to about 20 weeks gestation.
Content Courtesy : en.wikipedia.org
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