Which procedure involves withdrawing amniotic fluid between the 15th and 18th weeks of pregnancy?

• A. Amniocentesis
• B. Chorionic villus sampling
• C. Ultrasound
• D. Fetoscopy

Answer: (A)

Verified step by step guidance

1. Understand the purpose of the procedure: The procedure in question is used to withdraw amniotic fluid for testing. This fluid contains fetal cells and various chemicals produced by the baby, which can be analyzed for genetic disorders and other conditions.
2. Identify the timing of the procedure: The procedure is typically performed between the 15th and 18th weeks of pregnancy. This timing is crucial for obtaining accurate results while minimizing risks to the mother and fetus.
3. Differentiate between procedures: Amniocentesis involves withdrawing amniotic fluid using a needle inserted through the mother's abdomen. Chorionic villus sampling, on the other hand, involves taking a sample of placental tissue and is usually performed earlier in pregnancy. Ultrasound is a non-invasive imaging technique, and fetoscopy involves direct visualization of the fetus using an endoscope.
4. Recognize the procedure's name: The procedure that involves withdrawing amniotic fluid is called amniocentesis. This is distinct from other procedures like chorionic villus sampling, which involves placental tissue, and ultrasound, which is purely imaging.
5. Consider the risks and benefits: Amniocentesis carries some risks, such as miscarriage, but provides valuable information about the genetic health of the fetus. Understanding these factors can help in making informed decisions about prenatal testing.