Who fills out an advance directive?

An advance directive is typically filled out by an individual, often referred to as the principal, who wants to express their healthcare preferences in case they become unable to communicate them in the future. This document can include a living will, detailing specific medical treatments one does or does not want, and can also appoint a healthcare proxy to make decisions on their behalf. It's important for individuals to discuss their wishes with loved ones and healthcare providers when creating this document.