(1) The following individuals may consent to the medical orders contained on a POST form:

  (a) If a patient is capable of participating in the medical treatment decisions included on the POST form, the patient.

  (b) Subject to subsection (2), if a patient is not capable of participating in the medical treatment decisions included on the POST form, either of the following:

  (i) A patient representative who is a patient advocate.

  (ii) A patient representative who is a guardian after complying with section 5314 of the estates and protected individuals code, 1998 PA 386, MCL 700.5314.

  (2) If a patient representative is consenting to the medical orders contained on the POST form, the patient representative shall comply with the patient’s expressed wishes. If the patient’s wishes are unknown, the patient representative shall consent to the medical orders in the following manner:

  (a) If the patient representative is a guardian, in a manner that is consistent with the patient’s best interest.

  (b) If the patient representative is a patient advocate, subject to section 5509(1)(e) of the estates and protected individuals code, 1998 PA 386, MCL 700.5509.

  (3) Before a patient and an attending health professional or a patient representative and an attending health professional sign a POST form, the attending health professional shall provide the patient or the patient representative with the information form and, if the patient does not have a patient representative, the attending health professional shall recommend to the patient that the patient consider designating an individual to serve as the patient’s patient advocate to make future medical decisions on behalf of the patient if the patient becomes unable to do so. The attending health professional shall also consult with the patient or patient representative and explain to the patient or patient representative the nature and content of the POST form and the medical implications of the medical orders contained on the POST form. The patient or patient representative shall sign the information form at the time he or she signs the POST form under this subsection. The attending health professional who signs the POST form shall place the information form that is signed by the patient or the patient representative in the patient’s permanent medical record. The attending health professional who signs the POST form shall also obtain a copy or duplicate of the POST form and make that copy or duplicate part of the patient’s permanent medical record. The patient or the patient representative shall maintain possession of the original POST form.