The health care provider orders gentamicin (Garamycin) for a client with a postoperative wound infection. Which of the following laboratory results should prompt the nurse to consult with the...

The health care provider orders gentamicin (Garamycin) for a client with a postoperative wound infection. Which of the following laboratory results should prompt the nurse to consult with the prescriber about possible nephrotoxicity of this drug?

1. Elevated serum creatinine level

2. Decreased blood urea nitrogen (BUN) level

3. Increased white blood cell (WBC) count

4. Elevated serum iron level