Patients can give their preferences for their end-of-life care by making a living will. A patient records in writing their wishes for future care, addressing end-of-life scenarios in a standardized fashion.
Limitations: One may not be able to foresee the actual circumstances of one’s terminal condition; the will may be too vague about the unique conditions surrounding one’; death; it may be too generic to extend a patient’s autonomy beyond the point of incapacity; written wishes may be ambiguous, for instance, if there is a request for no intubation, it is difficult to determine whether it is a rejection of mechanical ventilation or a desire to avoid prolonged ventilator assistance when there is no scope for recovery, in which case the patient may accept a trial of ventilation for a potentially reversible condition.
Fins JJ, Nilson EG. Withholding and Withdrawing Life-sustaining Care. Hanks G, Cherny NI, Christakis NA, Fallon M, Kaasa S, Portenoy RK (Ed).Oxford Textbook of Palliative Medicine. Oxford University Press, 4th ed, 2010. pp. 320-329.