Final answer:
Chorionic villus sampling (CVS) can be performed during pregnancy at 10 weeks.
Step-by-step explanation:
Chorionic villus sampling (CVS) can be performed during pregnancy at 10 weeks. CVS is a prenatal test that involves taking a small sample of cells from the placenta, which can be analyzed to detect certain genetic disorders and birth defects. It is typically done in the first trimester, between weeks 10 and 13.