The Nurse Is Caring for a Patient Who Has Orders

The nurse is caring for a patient who has orders for a 17-ketosteroid (17-KS) test.Which preparation is most important for the nurse to make?

A) Keep the patient NPO after midnight the night before the test.
B) Ensure adequate space for the specimen container is available in the refrigerator.
C) Withhold the patient's metformin for 24 hours prior to the test.
D) Request an order for an antacid.