Final answer:
The therapeutic level of carbamazepine is between 4 to 12 mcg/mL, so a result of 10 mcg/mL would be considered therapeutic.
Step-by-step explanation:
The therapeutic level of carbamazepine in the blood typically ranges between 4 to 12 mcg/mL. Therefore, the result that indicates a therapeutic level from the options given is B. 10 mcg/mL. Doses above 12 mcg/mL are generally considered to be potentially toxic. Nurses and healthcare providers regularly monitor the carbamazepine levels in patients to ensure they remain within the therapeutic range, thereby minimizing the risk of side effects and maximizing the drug's efficacy.