A landmark court case in California determined that a competent adult patient has the right to forgo medical treatment and the patient's autonomy supersedes the state's interest in preserving the patient's life.
Presymptomatic genetic testing for neurodegenerative diseases can help patients make effective treatment decisions, but the medical profession needs to ensure that the increasing use of the tests is done responsibly.
Physicians can ethically withhold information in situations where full disclosure of a diagnosis or treatment would cause great psychological harm to the patient.