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A common term found in many pregnancy glossaries is "amniocentesis." Anmiocentesis is a test that is used to look for any chromosomal abnormalities in a baby. It can also test lung maturity. The test is given by inserting a small needle into a pregnant woman's abdomen and collecting a small amount of amniotic fluid. This can be done anywhere from 11 weeks until the end of the pregnancy. There is a slight risk of miscarriage. If a genetic disorder is detected, an appointment with a genetic counselor may be in order.