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 al t about the use of this medication?

Thyroid function tests should be performed every 6 months.

A pretreatment electroencephalogram (EEG) will be done.

Liver function tests must be monitored.

High serum sodium levels can cause toxic levels of valproate.