What does chorionic villus sampling provide for evaluation?

Chorionic villus sampling (CVS) is a prenatal diagnostic procedure that involves taking a small sample of the placental tissue, specifically the chorionic villi. This tissue contains genetic material from the fetus, allowing for the evaluation of chromosomal abnormalities and genetic disorders. CVS is typically performed between the 10th and 13th weeks of pregnancy and is particularly useful for early detection of conditions such as Down syndrome or other genetic syndromes.

By obtaining a sample of placental tissue, healthcare providers can conduct various tests, including karyotyping and molecular genetic testing, to identify potential fetal abnormalities at an early stage. This can help in the decision-making process for expectant parents regarding further diagnostic procedures or management options.

The other options do not align with the primary purpose of chorionic villus sampling, which is specifically aimed at detecting genetic issues rather than assessing fetal heart rate, maternal health, or measuring amniotic fluid levels.