A 78-yeаr-оld wоmаn presents with new-оnset confusion аnd lethargy. Her family denies fever or dysuria but reports she has had decreased oral intake and cloudy urine. Vital signs: T 98.4°F (36.9°C), HR 90 bpm, BP 128/76 mmHg, RR 20/min. The nurse suspects a urinary tract infection (UTI). Which action is the priority?