Thank you for the opportunity to help you with your question!
An advance health care directive,which is also known as an advance directive, living will or advance decision, is a legal document in which a patient specifies the actions that should be taken for his health if he is not any longer able to make decisions for himself due to illness or incapacity. In the U.S. it has a legal status in itself, whereas in some countries it is legally persuasive without being a legal document. Another form is a specific type of power of artoney in which the person authorizes someone (an agent) to make decisions on their behalf when they are incapacitated. People are often encouraged to complete both documents to provide comprehensive guidance regarding their care.
Please let me know if you need any clarification. I'm always happy to answer your questions.