Home >  Term: amniocentesis
amniocentesis

A diagnostic procedure for pregnant women to determine whether or not their fetuses have gross chromosomal anomalies. It involves sampling the liquid immediately surrounding a fetus within the amnion. This amniotic fluid is extracted through the mother's abdominal and uterine walls with a hypodermic needle. The amniotic fluid mostly contains fetal urine but also has millions of fetal skin cells that can be cultured to produce a karyotype. There is 99+% accuracy in diagnosing Down syndrome and most other gross chromosomal aberrations including neural tube defects such as spina bifida.

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