Amniocentesis is a test to look at the fluid (amniotic fluid) that surrounds your baby (fetus). Amniotic fluid has cells and other substances that can give clues about the health of your fetus.
Amniocentesis is done by gently putting a needle through your belly into your uterus. About 2 Tbsp (30 mL) of the amniotic fluid is taken out and looked at. Amniocentesis is generally done between weeks 15 and 20 (usually around week 16) to look at genetic information. It can also be used later in pregnancy to see how the fetus is doing.
Amniocentesis is offered to women who would like a test to find problems with the fetus.
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