Competence, capacity, and informed consent: beyond the cognitive-competence model.

Only competent persons can give informed consent to health care. Current approaches define competence in essentially cognitive terms, thereby ignoring the fact that someone may be cognitively competent yet lack the capacity to give a valid consent. I outline a more robust theory of competence that includes not only cognitive but also emotional and valuational parameters. I then distinguish competence from capacity, and indicate the role this distinction can usefully play in the extended and continuing care setting. I also show how this distinction is consistent with several recent Canadian legal decisions, and outline its usefulness in interpreting and applying relevant provincial statutes.