Sterile items that are out of vision or below the waist level of the nurse are considered unsterile.
Whenever the sterility of an object is questionable, assume the article is unsterile. Discard or resterilize objects that come into contact with unsterile objects. Handle sterile objects that come will touch open wounds or enter body cavities only with sterile forceps or sterile gloved hands. Sterile objects become unsterile when touched by unsterile objects. Commercially prepared sterile packages may not have indicators but are marked with the word sterile. If the color change is not evident, the package is considered unsterile. The indicator changes color during sterilization, indicating that the contents have undergone a sterilization procedure. The indicator is often a tape used to fasten the package or contained inside the package. Always check chemical indicators sterilization before using a package. Storage areas should be clean, dry, off the floor, and away from sinks. Any package that appears already open, torn, punctured, or wet is considered unsterile. Sterile articles can be stored for only a prescribed time after that, they are considered unsterile. Always check a package containing a sterile object for intactness, dryness, and expiration date. 
All articles are sterile appropriately by dry or moist heat, chemicals, or radiation before use.
All objects used in a sterile field must be sterile.
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