Amniocentesis is a procedure performed during pregnancy to examine a baby's chromosomes. Most often, an amniocentesis is done between 16 and 20 weeks of pregnancy (gestation). During this procedure, amniotic fluid is removed for testing.
What Can I Expect During an Amniocentesis?
First, the sonographer performs a detailed ultrasound examination. This takes about 30 minutes to complete. The sonographer checks the date of your pregnancy, screens for birth defects, checks the placenta, and evaluates the amniotic fluid levels.
Next, using ultrasound, the doctor chooses a "pocket," or area of amniotic fluid, for testing. Then, the doctor inserts a thin needle into the abdomen and uterus, and removes a small amount of fluid (about one ounce). This part of the procedure lasts about 1–2 minutes.
About video: Prenatal Diagnostic Testing: What pregnant women can expect when coming for an amniocentesis at BC Women's Hospital.
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