Which of the following procedures is performed after the 16th week of pregnancy and can be used to assess for chromosomal abnormalities?

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After about 16 weeks, an amniocentesis can be used to obtain amniotic fluid or genetic, biochemical, or other analysis. Under ultrasound guidance, a needle is guided through the abdomen and into the amniotic sac. Fetal cells isolated from amniotic fluid can be used to assess for fetal chromosomal abnormalities, fetal enzyme deficiencies, and certain discrete genetic mutations.

Which of the Following Procedures Is Performed After the 16th