Which statement about chorionic villus sampling is true?

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Multiple Choice

Which statement about chorionic villus sampling is true?

Explanation:
Chorionic villus sampling is a first-trimester prenatal test that obtains placental tissue (chorionic villi) for genetic analysis. The timing of about 9–11 weeks fits the typical CVS window, allowing early detection of chromosomal or genetic conditions. It uses placental tissue, not amniotic fluid, so the statement about using amniotic fluid is incorrect. CVS does carry a small miscarriage risk, so saying there is no miscarriage risk is inaccurate. It is not performed at 20–22 weeks, since that window is when amniocentesis is usually done.

Chorionic villus sampling is a first-trimester prenatal test that obtains placental tissue (chorionic villi) for genetic analysis. The timing of about 9–11 weeks fits the typical CVS window, allowing early detection of chromosomal or genetic conditions. It uses placental tissue, not amniotic fluid, so the statement about using amniotic fluid is incorrect. CVS does carry a small miscarriage risk, so saying there is no miscarriage risk is inaccurate. It is not performed at 20–22 weeks, since that window is when amniocentesis is usually done.

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