An amniocentesis test is done during pregnancy to check for genetic disorders or birth defects in the baby. A small amount of fluid is removed by a needle from the sac surrounding the baby in the uterus. The fluid is sent to a laboratory for analysis. The test is often given to women who are pregnant when they are 35 or older, had a previous screening that indicates there may be a birth defect, have had children previously with genetic disorders or they have a family history of genetic disorders.

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