A. In the absence of knowledge of the revocation of an advance directive, a person is not subject to civil or criminal liability or discipline for unprofessional conduct for carrying out the advance directive pursuant to the requirements of the Oklahoma Advance Directive Act.

B. A physician or other health care provider, whose actions under the Oklahoma Advance Directive Act are in accord with reasonable medical standards, is not subject to criminal or civil liability or discipline for unprofessional conduct with respect to those actions; provided, that this subsection may not be construed to authorize a violation of Section 3101.9 of this title. In making decisions and determinations pursuant to the Oklahoma Advance Directive Act the physician shall use his or her best judgment applying with ordinary care and diligence the knowledge and skill that is possessed and used by members of the physician's profession in good standing engaged in the same field of practice at that time, measured by national standards.

C. An individual designated as a health care proxy, pursuant to Section 3101.4 of this title, to make health care decisions for a declarant and whose decisions regarding the declarant are made in good faith pursuant to the Oklahoma Advance Directive Act, is not subject to criminal or civil liability, or discipline for unprofessional conduct with respect to those decisions.