A nurse is evaluating client understanding following teaching about lithium therapy for bipolar disorder. Which of the following statements by the client should alert the nurse to the need for further teaching?

"I will limit my time in the sun to avoid getting dehydrated."

"If I get the flu and can't eat or drink much, I'll keep taking my lithium as prescribed."

"I know I need to avoid a low-sodium diet while taking lithium."

"I’ll make sure to have my lithium blood level checked every few months."