A nurse is caring for a male client who reports nausea and vomiting and is receiving IV fluid therapy. The client's BUN is 32 mg/dl, creatinine 1.1 mg/dl, and hematocrit 50%. Which of the following actions should the nurse take?

Continue routine care because the results are within the expected reference range.

Evaluate urine output for amount and urine for specific gravity.

Decrease the IV fluid infusion rate and limit oral fluid intake.

Collect a urine specimen for culture and sensitivity.