Which nursing action has the highest priority the evening before an intravenous pyelogram (IVP) for a patient scheduled for left kidney removal due to renal disease and hypertension?
a) Administer a cathartic enema to cleanse the bowel
b) Obtain information about the patient's allergies
c) Instruct the patient to be NPO (nothing by mouth) after midnight
d) Teach that X-rays will be taken at multiple intervals