# Hand Hygiene and Asepsis

> Nursing notes on hand hygiene and asepsis: WHO five moments, handwashing steps and duration, medical versus surgical asepsis and sterile field rules.

- Canonical URL: https://prepelephant.com/topics/allied/nursing/hand-hygiene-and-asepsis
- Exam / course: Allied Health · Subject: Nursing
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "Hand Hygiene and Asepsis", PrepElephant, https://prepelephant.com/topics/allied/nursing/hand-hygiene-and-asepsis

## Direct answer

Hand hygiene is the single most effective measure against health-care-associated infection. The WHO five moments define when to clean hands: before touching a patient, before a clean or aseptic procedure, after body fluid exposure risk, after touching a patient, and after touching the patient's surroundings. A handwash with soap and water takes 40–60 seconds, an alcohol-based rub 20–30 seconds, both following the WHO technique from palms and backs of hands to fingertips, thumbs and wrists.

## What you must remember

- Use soap and water when hands are visibly soiled, after toilet use, and when spore-forming organisms such as Clostridioides difficile are involved (alcohol does not kill spores); otherwise an alcohol-based rub is acceptable.
- Medical (clean) asepsis reduces and confines organisms — hand hygiene, clean gloves, clean equipment and clean-to-dirty working.
- Surgical (sterile) asepsis eliminates all organisms — sterile gloves, gown, mask, field and instruments — required for catheterisation, sterile dressing and any invasive procedure.
- A sterile field is destroyed when it is out of view, below waist level, touched by non-sterile items, or wet, since moisture wicks organisms through fabric (strike-through).
- The outer 2.5 cm (1 inch) border of a sterile drape and anything below table height count as contaminated; a gown is sterile from chest to field level in front, and the axillae are never sterile.
- Open sterile packages by the outside wrapper only, pour solutions without splashing, and never reach over a sterile field or turn your back on it.
- Surgical scrub time is commonly 2–6 minutes by facility policy; the first scrub of the day extends from hands to elbows with the nails cleaned underneath.

## Common confusion

Medical and surgical asepsis get conflated: washing hands is medical asepsis even before surgery, while surgical asepsis begins when sterile gloves and a sterile field are created. Gloves are also wrongly treated as a substitute for hand hygiene — hands are contaminated during glove removal, and gloves develop micro-perforations. Finally, students forget that an alcohol rub fails against C. difficile spores, so the answer for that patient is soap and water.

## Exam-focused takeaway

The five moments, the durations (40–60 seconds wash, 20–30 seconds rub) and the sterile-field boundary rules are guaranteed material. Learn what breaches sterility — drape margin, below the waist, out of view, moisture — since questions present a scenario and ask whether the field remains sterile. Remember the hierarchy: hand hygiene first, gloves for anticipated contact, sterile technique for invasive procedures, and hand hygiene again after glove removal.

## Frequently asked questions

### What are the WHO five moments of hand hygiene?

Before touching a patient, before a clean or aseptic procedure, after blood or body fluid exposure risk, after touching a patient, and after touching the patient's surroundings.

### How long should handwashing and hand rub take?

A handwash with soap and water takes 40–60 seconds and an alcohol-based rub 20–30 seconds, covering all hand surfaces.

### When is soap and water mandatory rather than a rub?

When hands are visibly dirty, after toilet use, and when spore-forming organisms such as Clostridioides difficile are involved.

### What is the difference between medical and surgical asepsis?

Medical asepsis reduces and confines organisms (clean technique); surgical asepsis eliminates all micro-organisms (sterile technique) for invasive procedures.

### What renders a sterile field contaminated?

Falling below waist level, being left out of view, moisture soaking through the drape, or contact with any non-sterile object, including ungloved hands.