Final answer:
The nurse should report elevated blood glucose levels to the provider when reviewing the laboratory report of a child receiving prednisone.
Step-by-step explanation:
The laboratory result that the nurse should report to the provider is elevated blood glucose levels (option c).
Prednisone is a corticosteroid medication that can increase blood glucose levels. Elevated blood glucose levels can indicate diabetes or glucose intolerance, which may require adjustments in the child's treatment plan or additional monitoring.
Option a, elevated white blood cell count, may be expected and does not require immediate reporting. Option b, increased platelet count, and option d, decreased serum sodium levels, are not directly related to prednisone use and may not require immediate reporting unless the values are significantly abnormal.