A nurse is caring for a client who has bipolar disorder and a new prescription for valproate. Which of the following instructions should the nurse give the client about the use of this medication?

A. Valproate is associated with potential liver toxicity, so liver function tests must be monitored regularly during treatment. B. Thyroid function tests are not required with valproate therapy, although they are important for other medications, such as lithium. C. A pretreatment EEG is not necessary for valproate use. This test is typically used for clients with seizure disorders. D. High serum sodium levels are not related to valproate toxicity; however, low sodium levels can increase the risk of toxicity.