Final answer:
The document that indicates the parents' or guardians' choices of medical facilities for their children is a health care proxy.
Step-by-step explanation:
The document that indicates the parents' or guardians' choices of medical facilities for their children is health care proxy. A health care proxy is a legal document that appoints a specific person to make medical decisions for a patient if they are unable to speak for themselves. This document ensures that the parents or guardians can make choices about medical facilities on behalf of their children.