A Health Care Proxy is a legal document that allows an individual, known as the principal, to appoint someone else, called the agent, to make medical decisions on their behalf if they become unable to do so. This arrangement ensures that a trusted person can advocate for the principal's health care preferences in critical situations. The agent's authority typically includes decisions about treatments, surgeries, and end-of-life care. It is important for the principal to discuss their wishes with the agent to ensure that their values and preferences are respected. A Health Care Proxy is part of advance care planning, which helps individuals prepare for future health care needs.