The nurse is administering the sixth IV dose of gentamicin to a client with extensive full thickness burns. Which assessment finding warrants further intervention?

B Reports a sore mouth and three episodes of diarrhea that began this morning. C White blood count of 9,000/mm3 (9 x 10^9/L) and an oral temperature of 98.2┬░F (36.7┬░C) two hours ago. A Serum creatinine level of 1.6 mg/dL (141 ┬Ámol), a blood urea nitrogen (BUN) of 20 mg/dL (7.1 mmol/L). D Urinary output of 400 ml of clear, amber colored urine in the past eight hours.