An advance health care directive is a written set of instructions expressing your wishes for medical treatment. It may contain a health care power of attorney, where you name a person called a “health care agent” to decide treatment for you, and a living will, where you tell your health care agent and health care providers your choices regarding the initiation, continuation, withholding, or withdrawal of life sustaining treatment and other specific instructions. You may limit your health care agent’s involvement in deciding your medical treatment so that your health care agent will speak for you only when you are unable to speak for yourself or you may give your health care agent the power to speak for you immediately.