What happens during an amniocentesis?

  1. A small area of the abdomen is cleansed with an antiseptic.
  2. Under ultrasound guidance, the physician inserts a thin, hollow needle through your abdomen and uterus, and into the amniotic sac, away from the fetus.
  3. A small amount of fluid is removed through the needle and sent for laboratory analysis.

You are likely feel the initial needle stick and minor menstrual-like cramping or discomfort during the procedure. This can last for a few hours after the procedure.

How accurate is amniocentesis?

The accuracy of amniocentesis approaches 100%. There may be an inability to collect enough amniotic fluid to test, or failure of the collected cells to grow when cultured.

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