It is impossible to know the exact circumstances in which the advance directives are used. When you create the document, it is also impossible to know what medical options will be available, and how the ailing person's feelings might change. For these reasons, the person signing an advance care directive should select an agent who can be trusted to make judgments guided by an understanding of wishes as explicitly as possible. Mulling over end-of-life care with the healthcare agent can help a person sort out his or her feelings, preferences, and values.
Advance directives go by different names in different states, but two common ones are: Living Will and Durable Power of Attorney. A living will states the person's medical wishes that will guide health care if a person becomes mentally or physically unable to make decisions. A durable power of attorney for health care, or health care proxy form, designates a person to act on an ill person's behalf when necessary.
As you prepare these documents, it's a good idea to discuss all health care wishes and decisions with the doctor who is providing care.
Also, because state laws vary, make sure the advance directive complies with current state law. You can use an attorney to draft an advance care directive. Or check with a local hospital or seniors' organization. They may have staff members who can help your parent or family member prepare an advance directive.