Which document can a formal advance directive represent?

A formal advance directive can represent a durable power of attorney for health care because it is a legal document that allows an individual to designate another person to make healthcare decisions on their behalf in the event they become unable to do so themselves. This highlights the person’s wishes regarding medical treatment and interventions, ensuring their preferences are respected even if they cannot communicate them directly in the future.

In contrast, the other options serve different purposes. A do-not-resuscitate order specifically addresses end-of-life care and indicates a person's preferences about resuscitation efforts but does not encompass broader health care decisions. A patient consent form is used to obtain permission from a patient for a specific medical procedure or treatment, while an insurance policy is a contract that outlines coverage terms and does not pertain to personal health care decisions.