In this subchapter, "emergency services" means services that are usually and customarily available at a hospital and that must be provided immediately to:
(1) sustain a person's life;
(2) prevent serious permanent disfigurement or loss or impairment of the function of a body part or organ; or
(3) provide for the care of a woman in active labor or, if the hospital is not equipped for that service, to provide necessary treatment to allow the woman to travel to a more appropriate facility without undue risk of serious harm.