A prenatal diagnosis procedure that can be performed earlier than amniocentesis involves sampling the _____.
A) yolk sac material
B) allantois
C) chorion
D) yolk sac
E) umbilical cord

Question

A prenatal diagnosis procedure that can be performed earlier than amniocentesis involves sampling the _____.  
A) yolk sac material
B) allantois
C) chorion
D) yolk sac
E) umbilical cord

Quizplus · Accepted Answer

Chorionic villus sampling (CVS) involves sampling cells from the chorion, which is the outermost membrane surrounding the embryo/fetus. CVS can be performed as early as 10-12 weeks of pregnancy, earlier than amniocentesis which is generally performed around 16 weeks.

A Prenatal Diagnosis Procedure That Can Be Performed Earlier Than