Which procedure involves a needle puncture of the amniotic sac to withdraw fluid for analysis?

• A. Apgar Test
• B. Amniocentesis
• C. Ultrasound
• D. Chorionic Villus Sampling

Answer: (B)

Amniocentesis is the procedure that involves using a thin needle to puncture the amniotic sac in order to withdraw a sample of amniotic fluid for analysis. This fluid contains cells from the fetus, which can provide valuable information about the baby's health and development. Amniocentesis is performed typically during the second trimester of pregnancy, and the fluid can be tested for genetic conditions, fetal infections, and other potential issues.

The other procedures listed have different purposes: the Apgar Test is a quick assessment of a newborn's health immediately after birth, typically evaluating their appearance, pulse, grimace response, activity, and respiration. An ultrasound uses sound waves to create images of the fetus in the womb, allowing for monitoring of fetal growth and development. Chorionic Villus Sampling, on the other hand, involves taking a small sample of placental tissue for genetic testing, which is different from amniocentesis because it does not involve withdrawing amniotic fluid. Thus, amniocentesis specifically addresses the need for fluid analysis during pregnancy.