Final answer:
The White blood cell (WBC) count of 18,500/μL should be brought to the attention of the surgeon immediately.
Step-by-step explanation:
The test result that should be brought to the attention of the surgeon immediately is the White blood cell (WBC) count of 18,500/μL. This high WBC count indicates a potential infection or inflammation in the body, which may increase the risk of complications during surgery.