405 ILCS 5/3-602
The petition shall be accompanied by a certificate executed by a physician, qualified examiner, psychiatrist, advanced practice psychiatric nurse, or clinical psychologist which states that the respondent is subject to involuntary admission on an inpatient basis and requires immediate hospitalization. The certificate shall indicate that the physician, qualified examiner, psychiatrist, advanced practice psychiatric nurse, or clinical psychologist personally examined the respondent not more than 72 hours prior to admission. It shall also contain the physician's, qualified examiner's, psychiatrist's, advanced practice psychiatric nurse's, or clinical psychologist's clinical observations, other factual information relied upon in reaching a diagnosis, and a statement as to whether the respondent was advised of his rights under Section 3-208.
405 ILCS 5/3-602