When preparing a patient for amniocentesis, which pre-procedure instruction is essential?

• A. Have the client drink water to fill the bladder.
• B. Place the client in a prone position.
• C. Administer a sedative.
• D. Ask the client to void.

Answer: (D)

Amniocentesis is performed with ultrasound guidance to insert a needle into the amniotic sac through the abdominal wall. Having an empty bladder is essential because a full bladder can distort anatomy and, more importantly, increases the risk of needle puncture and injury to the bladder during insertion. Asking the patient to void just before the procedure provides a clearer, safer path for the needle and reduces potential complications. The patient is usually positioned supine or with a slight tilt, not prone, and sedatives are not routinely used for this procedure. Drinking water to fill the bladder would counteract safety goals, and a sedative isn’t typically necessary.