Final answer:
The value that indicates an adverse effect of carbamazepine is an elevated white blood cell count.
Step-by-step explanation:
The correct answer is 3. White blood cell count, 3000 mm3 (3.0 × 109/L).
Elevated white blood cell count (WBC) is indicative of an adverse effect of carbamazepine. An increase in WBC count can suggest bone marrow suppression, which is a potential side effect of the medication.
It is important for patients taking carbamazepine to have regular blood tests to monitor their WBC count, as the medication can cause suppression of bone marrow function.