425 899 2200 (Kirkland office); 425 688 8111 (Bellevue office)

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Chorionic Villus Sampling (CVS) and amniocentesis are ways to collect a sample of the baby’s cells or fluid to diagnose chromosome problems, birth defects in the spine or abdomen, and sometimes other genetic conditions.

Amniocentesis

This test is done between 15-22 weeks.  It involves taking a small amount (2 tablespoons or less) of the fluid from the sac around the baby, using ultrasound to guide the test. There are cells from the baby’s skin floating in the fluid.  These cells can be tested to diagnose chromosome problems, and sometimes other genetic diseases, in the baby.  The amount of a certain protein, AFP, in this fluid is also measured to see if the baby has a birth defect such as spina bifida or an abdominal wall defect.  Results take about two weeks.  Amniocentesis can also cause miscarriage.  This happens in about ½% to 1% (1 to 2 in every 200 women) of women who have amniocentesis.

Making a Decision:  

You are the only one who can decide if any of these tests are the right thing for you.  Some families choose to do only the screening tests; some families choose to go directly to a test that can diagnose birth defects.  Other families do a combination of tests.  The genetic counselors at Eastside Maternal-Fetal Medicine and your doctor can help you think through this decision.  If you live in the Seattle/King County area, and you would like to talk more about these tests and making a decision please call us at (425) 688-8111 or (425) 899-2200 to schedule an appointment.

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Last modified: August 31, 2008