A 59-year-old woman who had a total abdominal hysterectomy and bilateral salpingo-oophorectomy 3 days ago is complaining of flank pain and a burning sensation with urination. Her total urine output during the previous 8 hours was 210 mL. The client's temperature is 101.3°F. You call the physician to report this information and receive these orders. Which will you implement first?