A nurse is assisting in the care of a 3-year-old preschool child who has extreme manifestations of lead poisoning. Which of the following actions should the nurse perform first?

Schedule the child for a follow-up blood test to monitor lead levels over the coming weeks.

Provide supportive care to manage common symptoms of nausea and pain.

Promote a balanced diet rich in calcium and iron to help mitigate the lead absorption.

Notify the health department to investigate potential lead exposure sources.