What is the miscarriage rate associated with chorionic villi sampling?

Chorionic villus sampling (CVS) is a prenatal test that involves taking a sample of tissue from the placenta to test for various genetic conditions. The miscarriage rate associated with CVS has been reported to be around 1% to 2% (which translates to approximately 10 in 1,000 procedures). This rate indicates a higher risk compared to procedures such as amniocentesis.

Understanding that CVS is an invasive procedure helps clarify why the miscarriage rate is a consideration during counseling for expectant parents. It's also important to know that while the risk of miscarriage is a critical aspect, the decision to undergo CVS often also involves weighing the benefits of obtaining rapid genetic information and the management of potential genetic disorders. Thus, the correct answer reflects the typical range recognized in medical literature regarding the risk of miscarriage following this sampling technique.