Having an advance directive is very important. You may become physically or mentally unable to communicate your desires for medical care if you have an accident or become ill. Your family and doctors will understand your preferences better if you have expressed them in writing.
One way to accomplish this is through an advance directives form that names a durable power of attorney for healthcare choices.
Advance directives allow you to state exactly what treatments you do or do not want if you are unable to communicate your wishes.