The Nurse Receives Information That an Assigned Patient Is Scheduled

The nurse receives information that an assigned patient is scheduled for an ultrasound of an endocrine gland. Which instruction does the nurse give the patient?

A) Wear clothing with an elastic waistband.
B) Remain NPO for 12 hours prior to testing.
C) Do not wear a tight or high-necked shirt.
D) Wash hair with antimicrobial shampoo.