Amniocentesis
Alternative Names: Culture - amniotic fluid; Culture - amniotic cells
Amniocentesis is a test sometimes done during pregnancy that looks for birth defects and genetic problems in the developing baby.
Why is the Test Performed?
Amniocentesis can be used to diagnose many different gene and chromosome problems in the baby, including:
- Anencephaly
- Down syndrome
- Rare, metabolic disorders that are passed down through families
It can also help:
- Determine how well the baby's lungs are developed
- Detect spina bifida and other neural tube defects
- Detect Rh incompatibility
- Diagnose an infection in the baby
How is the Test Performed?
Amniocentesis removes a small amount of fluid from the sac that surrounds the baby in the womb (uterus). It is usually done in a doctor's office or medical center. You do not need to stay in the hospital.
You will probably have a pregnancy ultrasound first. This helps your health care provider find out exactly where the baby is in your womb.
Numbing medicine is then rubbed onto part of the your belly. Sometimes, the medicine is given through a shot in the skin on the belly area.
The health care provider inserts a long, thin needle through your belly and into the womb. A small amount of fluid is removed from the sac surrounding the baby.
Preparation for the Test
Your bladder must be full for the ultrasound.
Before the test, blood may be taken to determine your blood type and Rh factor. You may get an shot of medicine called Rhogam if you are Rh negative.
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How will the Test Feel?
If you get a shot of numbing medicine, you may feel a sharp, stinging sensation for a few seconds.
Some women feel a sharp pain for a few seconds when the needle enters the sac surrounding the baby.
Some women feel pressure in the lower belly area when the fluid is removed. After the procedure, you may have some minor cramping.
Amniocentesis Risks
Risks are minimal, but may include:
- Infection or injury to the baby
- Miscarriage
- Leaking of amniotic fluid
- Vaginal bleeding
Considerations
There may be alternatives to the amniocentesis. Discuss these other tests with your health care provider.
Normal Results for Amniocentesis
A normal result means:
- No genetic or chromosome problems were seen in your baby
- Bilirubin and alpha fetoprotein levels appear normal
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What Abnormal Results Mean
An abnormal result may mean your baby has a gene or chromosome problem, or other health condition. Talk to your doctor about the meaning of your specific test results.
DNA testing is available for many of the diseases that may be detected during amniocentesis. Ask your obstetrician or geneticist if you have a question about a specific disease.
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Reviewed By: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine; Susan Storck, MD, FACOG, Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Bellevue, Washington; Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
Copyright 2011 A.D.A.M., Inc.
