Final answer:
The nurse should instruct the parents to plan for a follow-up echocardiogram occurring in 4 to 6 weeks for a toddler with Kawasaki disease.
Step-by-step explanation:
The nurse should provide the instruction to plan for a follow-up echocardiogram occurring in 4 to 6 weeks during the discharge education for a toddler with Kawasaki disease receiving intravenous immunoglobulin for severe coronary inflammation. This is an important follow-up test to assess the effectiveness of the treatment and monitor the toddler's cardiac condition. It allows healthcare providers to evaluate any changes in the coronary arteries and determine if further interventions or treatments are necessary.