Instrumentation for many surgical procedures is shown according to the body systems involved. Each unit begins with a basic set of instruments or most of the instruments required to perform that surgery. Most of the basic units begin with a description of how the instruments are used in those procedures.Knowing the classification and the correct type of sterilization to be used for each instrument will assist you in any perioperative role, whether you work in the central service, the ambulatory surgery, or the operating room.