Mich. Comp. Laws § 330.1420
If a written notice of termination of mental health treatment is given to a hospital or provider of mental health treatment under section 419, if the notice is not withdrawn, and if the hospital director or provider of mental health treatment determines that the patient is a person requiring treatment and should remain in the hospital or continue to receive mental health treatment, the hospital director, provider of mental health treatment, or other suitable person shall within 3 days after receipt of the notice file a petition with the court that complies with section 434. The petition shall be accompanied by 1 clinical certificate executed by a psychiatrist and 1 clinical certificate executed by either a physician or a licensed psychologist. If a petition is filed, the hospital or provider of mental health may continue hospitalization or mental health treatment of the patient pending hearings convened under sections 451 to 465.
MCL 330.1420