An Oklahoma medical power of attorney form is used to appoint a representative (“healthcare proxy” or “attorney-in-fact”) to make decisions for the principal relating to healthcare treatments and operations. The principal can be specific about the powers granted unto the healthcare proxy or they can choose to give them the power to make all medical decisions. This power of attorney form usually only comes into effect in the event of the principal’s inability to make competent decisions for themselves. However, the principal may choose to make the document effective immediately upon execution. Instead of a medical power of attorney form, the principal can complete an Advance Directive for Health Care. This document enables the principal to leave instructions for physicians in regard to life-sustaining treatments they do or do not wish to receive as well as appoint a healthcare proxy.