This is one of those questions where I have to say that it is a matter of provincial-territorial law, so I can't claim any expertise. I am sure there are some differences in the modalities, in the technical details about what the form must look like, if there is a specific form that an advance directive needs to be in, and how many years in advance a person can make one. There might be some differences.
But on the whole, the idea is the same everywhere, which is that people can state, “If something happens to me and I become unable to express my wishes, these are my wishes that I want carried out when I'm no longer able to convey them.” The general principle would be the same everywhere, I would think, but there may be some small differences.
We think this might be something my colleagues from Health Canada would be better able to answer.