I have been learning about this at college.
Basically no you can't.
If you are in a hospital and are critically ill and you are unfit to make a decision then the doctor has to do all they can to preserve your life.
Say if somebody has cancer... and they have written an informal document and said that they don't want anymore treatment... the doctor will give it them anyway, if they didn't... It would be euthanasia, wouldn't it?
The job of a hospital is the preserve life... if your life is at risk they have the power to give you treatment without your say so. Unless it's like a joviss (Can't spell it) witness... still they sometimes go ahead and give treatment in those circumstances anyway without say so.
Well I think that's right anyway. Sorry if it's not and not at all helpful.
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