The nurse is caring for a client with a medical prescription for clozapine [Clozaril]. The nurse knows which of the following is the priority laboratory value that should be reviewed prior to medication administration?

A. Clozapine requires regular monitoring of the white blood cell count due to the risk of agranulocytosis, a potentially serious side effect. B. While potassium levels are important, they are not the primary concern with clozapine administration. C. BUN/Creatinine levels are monitored for kidney function but are not specific to clozapine. D. Sodium levels are not the primary concern with clozapine administration.