S.C. Code Ann. § 44-80-100: POST form effective until revoked or new form executed; annual review and update.

A POST form executed pursuant to this chapter remains effective until revoked or until a new POST form is executed pursuant to this chapter. Any physician who is responsible for the creation and execution of a POST form shall make reasonable efforts to periodically review and update the POST form with the patient as the patient's needs dictate but at least once per year.