NCLEX-RN® question of the day

A 58-year-old client with a history of type 2 diabetes is admitted following a 3-day episode of vomiting and diarrhea. On assessment, the nurse notes blood pressure of 88/54 mmHg, heart rate of 118 bpm, urine output of 15 mL/hr over the past 2 hours, and serum creatinine of 3.1 mg/dL (baseline 0.9 mg/dL). The client's BUN is 52 mg/dL and urine sodium is 8 mEq/L. Which of the following findings most strongly indicates the underlying cause of this client's acute kidney injury?

1. ASerum creatinine of 3.1 mg/dL
2. BBUN of 52 mg/dL
3. CUrine output of 15 mL/hr
4. DUrine sodium of 8 mEq/L