One is a durable power of attorney for healthcare, or healthcare proxy. The other is a living will or medical directive. Some people have a combination of the two. Laws vary from state to state regarding advance directives. Contact an attorney or a hospital in your area for information about your state's laws.
Advance directives have several functions.
This usually involves decisions about breathing machines, CPR, food, water, and medications. To assist your family in making decisions. To make sure your wishes are followed if they are different from your family's wishes. A durable power of attorney for healthcare is not the same as a regular power of attorney. You must have a specific durable power of attorney for healthcare if you want the person with your power of attorney to make healthcare decisions for you.