Which procedure involves puncturing the amniotic sac to withdraw fluid?

• A. Amniocentesis
• B. Angiography
• C. Arthrocentesis
• D. Aspiration

Answer: (A)

The defining idea is puncturing the amniotic sac to withdraw fluid. This procedure, performed under imaging guidance, inserts a needle through the mother's abdomen into the amniotic cavity to collect amniotic fluid for testing fetal cells and other components. That precise targeting of the amniotic sac distinguishes it from the others: angiography images or treats blood vessels, arthrocentesis samples joint fluid, and aspiration is a general term for drawing fluid from any space. So this procedure is the one that specifically involves the amniotic sac.