During a sterile procedure, is it permissible to reach over the sterile field?

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During sterile procedures, keep the sterile field uncontaminated by never reaching over it. Reaching over can bring contaminants from your clothing, arms, or nonsterile air into the field, and air currents or droplets may settle onto the sterile surface. To maintain sterility, work from the sides and have instruments or supplies passed at the edge of the field or handed to you by a sterile assistant without your hands crossing over the field. So, it is not permissible to reach over the sterile field.