In sterile technique, how far outside the edge of a sterile field is considered nonsterile around the object?

In sterile technique, how far outside the edge of a sterile field is considered nonsterile around the object?

• A. 2 inches
• B. 1 inch
• C. 3 inches
• D. 4 inches

Answer: (B)

In sterile technique, the area inside the sterile field is kept sterile, while a surrounding nonsterile margin acts as a safety buffer. The boundary is one inch wide. This small buffer helps prevent contamination from accidental contact, moisture, or movement near the edge, since those factors can easily transfer microbes to the sterile area. Practically, keep hands and instruments well inside that inner zone, avoid reaching over the field, and if anything touches or crosses the border, treat it as contaminated and re-sterilize or replace as needed. A wider border isn’t used because it would unnecessarily hinder workflow, and a border smaller than one inch wouldn’t provide reliable protection. One inch is the standard you’ll see in practice and testing.

In sterile technique, the area inside the sterile field is kept sterile, while a surrounding nonsterile margin acts as a safety buffer. The boundary is one inch wide. This small buffer helps prevent contamination from accidental contact, moisture, or movement near the edge, since those factors can easily transfer microbes to the sterile area. Practically, keep hands and instruments well inside that inner zone, avoid reaching over the field, and if anything touches or crosses the border, treat it as contaminated and re-sterilize or replace as needed. A wider border isn’t used because it would unnecessarily hinder workflow, and a border smaller than one inch wouldn’t provide reliable protection. One inch is the standard you’ll see in practice and testing.