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Sterile Technique
& the Sterile Field

Master aseptic principles, build and protect a sterile field, and prevent healthcare-associated infections.

NCLEX-RN

What Is Sterile Technique?

Sterile (surgical asepsis) means the complete absence of all microorganisms, including spores. Sterile technique uses practices that keep an object or area entirely free of microbes during invasive procedures.

Clean vs. Sterile

Medical Asepsis
Clean technique. Reduces the number and spread of microbes. Examples: handwashing, gloves for routine care, clean dressings.
Surgical Asepsis
Sterile technique. Eliminates all microbes and spores. Examples: sterile gloves, sterile field, invasive procedures.

Why It Matters

A break in sterile technique can introduce pathogens directly into a normally sterile body site, causing a healthcare-associated infection (HAI). Risk rises with exposure time and number of breaks.

Anatomy of a Sterile Field

Sterile Field (drape surface) 1-inch (2.5 cm) outer border = CONTAMINATED Items must stay above waist / table level Item Item

The Core Principles of Sterility

1
Sterile touches sterile only. If a sterile item touches anything non-sterile, it is contaminated.
2
Keep the field in view. Never turn your back on or reach across a sterile field.
3
Above the waist, in front of the body. Below waist level is considered contaminated.
4
Keep it dry. Moisture wicks microbes from a non-sterile surface (strike-through contamination).

More Sterility Rules

5
The 1-inch border is contaminated. Place all items inside, away from the edge.
6
Do not reach over the field. Air currents and falling particles contaminate it.
7
Doubt equals contaminated. If sterility is uncertain or unknown, discard and restart.

Sterile vs. Contaminated Zones

Sterile Contaminated
Drape areaTop surface, inside borderOuter 1-inch border
HeightAbove waist / table levelBelow waist / table level
MoistureDryWet (strike-through)
Out of sightIn direct viewBehind you / unseen

How to Set Up a Sterile Field

1
Hand hygiene and gather supplies; check all package integrity and expiration dates.
2
Position above waist on a clean, dry surface; open the outermost flap away from you first.
3
Add sterile items by dropping them onto the field without reaching across it.
4
Don sterile gloves and keep gloved hands above waist, in view at all times.

Opening a Sterile Package

1. Far flap first 2 & 3. Sides 4. Nearest flap last (toward you) Sterile contents

Example 1: Pouring a Solution

A nurse needs to pour sterile saline into a basin on the sterile field. The bottle was opened 30 minutes ago and recapped. What should the nurse do?

Example 2: A Drop of Water

During a dressing change, a few drops of fluid soak through the sterile drape onto the non-sterile table beneath. Is the field still sterile?

Example 3: Lowered Hands

After donning sterile gloves, a nurse lowers both hands to her sides while a colleague positions the patient. She then returns to the field. Can she proceed?

Common Mistakes

✕ Reaching Across
Reaching over the sterile field drops skin particles and lint onto it.
✕ Using the Border
Placing items on the outer 1-inch border, which is always contaminated.
✕ Turning Away
Leaving the field unattended or out of sight, even briefly.
✕ Ignoring Moisture
Continuing after a wet strike-through soaks the drape.

Quick Reference Summary

Situation Sterile = Safe Action if Broken
Package wet/tornIntact & dryDiscard, get new
Item on borderInside 1-inch borderRe-position / replace
Hands loweredAbove waist, in viewReglove
Sterility unknownVerified sterileTreat as contaminated

Question 1 of 5

Which portion of a sterile drape is considered contaminated?

Question 2 of 5

A nurse notices that a sterile drape has become wet from a spilled solution. What is the most appropriate action?

Question 3 of 5

When opening a sterile package on a table, which flap should be opened first?

Question 4 of 5

After donning sterile gloves, the nurse should keep her hands:

Question 5 of 5

A nurse is unsure whether a sterile item touched a non-sterile surface. What should she do?