Abstract: A mobile ambulatory surgery center comprises a motor vehicle in which patients can schedule and undergo nonemergency, nonlife threatening, elective surgical procedures. The motor coach has a front driver's cab and a main body section which houses the ambulatory surgery center. Within the main body section, there are designated and separate sterile and nonsterile areas. An expandable portion of the main body enlarges the sterile area and creates a patient flow pattern which protects the integrity and sterility of the operating room. The separation of sterile and nonsterile areas allows the vehicle to have a business and a medical section and function autonomously as an ambulatory surgery center.