Final answer:
The true statement regarding end-of-life care is that the existence of an advance directive does not affect a patient's right to access care. However, known advance directives, like living wills and DNR orders, must be respected and can guide medical decisions, reflecting the patient's wishes for end-of-life care.
Step-by-step explanation:
Regarding end-of-life care, treatment, and services, the statement that The existence or lack of an advance directive does not determine the patient's right to access care, treatment, and services is true. Whether or not a patient has an advance directive, medical facilities are obligated to provide care. However, if an advance directive is present and known, it should guide the delivery of care in line with the patient's wishes, save for a few situations where it might be legally or ethically challenged.
Advance directives include documents such as living wills and Do Not Resuscitate (DNR) orders, which detail the specific interventions a person wishes to be carried out or omitted in case they become unable to make their own medical decisions. Cultural perspectives upbringing, and legal considerations such as those seen in the Death with Dignity acts and hospice care philosophies, influence decisions around end-of-life care. Proactive quality-of-life decisions and the changing concept of hospice reflect our society's evolving view on the dignity and comfort during the dying process. The field of medicine plays a critical role in these decisions, balancing ethical considerations and individual autonomy.