basic principles of asepsis

Principles and Practices of Surgical Asepsis

All objects used in a sterile field must be sterile. All articles are sterile appropriately by dry or moist heat, chemicals, or radiation before use. Always check a package containing a sterile object for intactness, dryness, and expiration date. Sterile articles can be stored for only a prescribed time; after that, they are considered unsterile. […]