Every person has the right to refuse (or accept) medical treatment, but the difficulty arises when you wish to ensure that you receive the treatment that you want when you are not able to make your preferences clear.
Also you need to make your wishes about your future health care clear while you still have what is called "capacity". Some informal ways of doing this are by making your wishes known to friends, relatives and your doctor, and by writing your wishes down.
There are also formal, legal ways to make sure that your wishes are respected. These are called; enduring guardianship and advanced health care directives or living wills. See us to draw these up for you or see the following links for further information: lawsociety.com.au
It is a Living Thing [luchettilawyers.com.au/itsalivingthing.asp]