Okla. Stat. tit. 63, § 63-3101.6: Advance directive - Revocation

A. An advance directive may be revoked in whole or in part at

any time and in any manner by the declarant, without regard to the

declarant's mental or physical condition. A revocation is effective

upon communication to the attending physician or other health care

provider by the declarant or a witness to the revocation.

B. The attending physician or other health care provider shall

make the revocation a part of the declarant's medical record.