Surgical Hand Antisepsis: Scrub, Rub, and Waterless Techniques

Objective. The student will perform a timed surgical hand scrub and an alcohol-based hand rub using the counted-stroke and timed methods to manufacturer and facility-protocol specifications.

Why Surgical Hand Antisepsis Matters

Surgical hand antisepsis is one of the most critical steps you will perform before every operative procedure. Your hands are a primary vector for transient and resident microorganisms. Even when wearing sterile gloves, undetected glove perforations can occur during surgery. A thorough surgical hand antisepsis dramatically reduces the microbial load on your skin so that any breach in glove integrity is less likely to introduce pathogens to the sterile field or the patient's wound. Patient safety begins at the scrub sink—before you ever enter the operating room.

The Two Categories of Skin Flora

Your skin harbors two types of microorganisms. Transient flora live on the surface layers of the skin and are acquired through contact with the environment and patients. They are relatively easy to remove with soap and water or an antiseptic product. Resident flora live in the deeper layers of the skin, including hair follicles and sebaceous glands. They cannot be completely eliminated, but effective surgical hand antisepsis suppresses them to the lowest possible level and provides persistent (residual) antimicrobial activity that continues working under your gloves throughout the procedure.

Approved Antiseptic Agents

Two antiseptic agents are most commonly used for surgical hand antisepsis in the United States.

Chlorhexidine gluconate (CHG) is a broad-spectrum agent effective against gram-positive and gram-negative bacteria, some fungi, and enveloped viruses. Its greatest advantage is persistent activity: it binds to skin proteins and continues to suppress microorganism growth after the scrub is complete. CHG has minimal absorption and is the agent most widely used in surgical scrub products.

Povidone-iodine (PVP-I) is also broad-spectrum and is an acceptable alternative. It has less persistent activity than CHG and can cause skin irritation with repeated use.

Alcohol-based surgical hand rubs (ABHRs) typically contain ethanol or isopropanol. They achieve rapid kill of transient flora and, when combined with additional agents such as CHG, also provide persistent activity. ABHRs are used only when hands are visibly clean and free of debris before application.

The Traditional Counted-Stroke Method

The counted-stroke method uses a sterile brush or sponge and an antiseptic solution. Each anatomical surface receives a prescribed number of strokes, ensuring consistent coverage regardless of how long each motion takes. The standard anatomical sequence moves from fingernails to forearms, and each hand and arm is scrubbed to two inches above the elbow.

General sequence:

1. Remove all jewelry (rings, watches, bracelets). Inspect hands and forearms for cuts or skin breaks.

2. Adjust water to a comfortable, warm temperature.

3. Wet hands and forearms. Apply antiseptic solution.

4. Use a sterile nail pick to clean beneath each fingernail under running water. Discard the pick after use.

5. Begin scrubbing with a sterile brush or sponge. Scrub each surface of each finger, the web spaces, the palmar and dorsal surfaces of the hand, the wrist, the forearm, and up to two inches above the elbow, using the designated stroke count for each surface per facility protocol.

6. Rinse each hand and arm thoroughly by allowing water to run from fingertips to elbow (hands always higher than elbows to prevent contaminated water from flowing back over clean areas).

7. Repeat the sequence on the second hand and arm.

8. Dry hands with a sterile towel using a blotting motion from fingertips toward elbows—one end of the towel per hand.

The Timed Method

The timed method substitutes a measured time period—typically three to five minutes, per facility or manufacturer protocol—for a stroke count. The anatomical sequence and the principle of hands-higher-than-elbows remain identical. Both methods are equally acceptable; follow your facility's policy.

Alcohol-Based Surgical Hand Rub (Waterless Technique)

ABHR products are used when the hands have been pre-washed with plain soap and water and are free of visible soil. Do not use an ABHR if hands are visibly soiled.

General sequence:

1. Wash hands with plain soap and water; clean under nails with a nail pick. Dry completely.

2. Apply the ABHR product to the palm of one hand according to the manufacturer's specified volume.

3. Dip the fingertips of the opposite hand into the product to treat the subungual area.

4. Spread the product over all surfaces of that hand and forearm up to the elbow while maintaining wet contact.

5. Apply a second dose and repeat on the other hand and forearm.

6. Continue rubbing until the product is completely dry—do not wipe or rinse it off.

7. Gown and glove immediately after hands are dry.

Critical Safety Points

Never recontaminate a scrubbed hand by touching the sink, faucet handle, or any non-sterile surface after the scrub. Use foot, knee, or elbow controls.
Hands must remain higher than elbows throughout rinsing to direct contaminated water away from cleaned areas.
Any break in the sequence—touching a non-sterile surface—requires restarting the entire scrub.
Inspect hands for cuts or abrasions before each scrub. Open wounds may compromise the integrity of the antisepsis process and must be reported to the charge nurse or surgeon.
Never dry scrubbed hands on an unsterile towel; use the sterile towel provided in the gown package.

The Fluorescent Lotion Exercise

Applying a fluorescent lotion before your scrub, then viewing your hands under UV light afterward, reveals exactly which surfaces received insufficient contact. Common missed areas include the thumb web space, the dorsal aspect of the fifth finger, and the area just proximal to the wrist. Document these findings and correct your technique before your next return demonstration.

NBSTSA CST Exam Relevance

Surgical hand antisepsis is tested on the NBSTSA CST examination under the domain of aseptic technique. You are expected to know the rationale for each step, the properties of antiseptic agents, the consequences of breaks in technique, and the correct sequence from nail pick through sterile drying.

Key terms10

Transient floraMicroorganisms that reside on the surface layers of the skin, acquired through environmental or patient contact, and relatively easily removed by antiseptic agents.

Resident floraMicroorganisms that live in the deeper layers of the skin such as hair follicles; they cannot be completely eliminated but are suppressed by surgical hand antisepsis.

Persistent (residual) activityThe continued antimicrobial effect of an antiseptic agent on the skin surface after the scrub is completed, which suppresses microbial regrowth under gloves during the procedure.

Chlorhexidine gluconate (CHG)A broad-spectrum antiseptic agent widely used in surgical scrub products, prized for its strong persistent activity due to binding with skin proteins.

Counted-stroke methodA surgical hand antisepsis technique in which each anatomical surface of the hand and forearm receives a specific number of scrub strokes to ensure consistent coverage.

Timed methodA surgical hand antisepsis technique in which the scrub is performed for a set amount of time (per facility or manufacturer protocol) rather than a stroke count, following the same anatomical sequence.

Alcohol-based hand rub (ABHR)A waterless surgical hand antisepsis product containing alcohol (such as ethanol or isopropanol) used when hands are visibly clean; applied to hands and forearms and allowed to dry completely without rinsing.

RecontaminationThe inadvertent contact of a scrubbed hand or arm with a non-sterile surface after hand antisepsis has been completed, which requires the scrub to be repeated.

Subungual areaThe space beneath the fingernails, which harbors a high concentration of microorganisms and must be cleaned with a nail pick during surgical hand antisepsis before the scrub or rub begins.

Anatomical sequenceThe prescribed order of scrubbing from fingertips to two inches above the elbow, ensuring that scrubbing progresses from the cleanest area (fingers) toward the less critical area (forearm) without retracing.

In class: Instructor demonstration: live side-by-side demo of traditional counted-stroke brush scrub versus timed scrub versus alcohol-based rub, noting rationale for each step. · Return demonstration in pairs: each student performs both scrub methods while a partner uses an observation checklist to mark each critical step as performed or omitted. · Fluorescent lotion exercise: students apply fluorescent lotion as a soil surrogate, perform their scrub technique, then view hands under UV light and document areas of insufficient coverage.
Materials: Surgical scrub brushes and sponges, chlorhexidine gluconate scrub solution, alcohol-based hand rub product, nail picks, UV fluorescent lotion kit, UV lamp, AST scrub checklist
Check: Instructor observation using AST scrub checklist; all critical steps (nail pick use, anatomic sequence, no recontamination) must be marked satisfactory; 100% of critical steps required to pass.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.