4.2 Aseptic Technique, Hand Hygiene & Garbing Protocols
Key Takeaways
NAPRA's recommended garbing order starts on the dirty side of the anteroom with hair cover, beard cover (if needed) and face mask, then shoe covers while stepping over the demarcation line.
Hand hygiene means using a nail pick under warm running water, then washing hands and forearms to the elbows with soap for at least 30 seconds (no brushes) and drying with a lint-free disposable towel.
After washing, apply an alcohol-based hand rub with persistent activity and put on the gown; then apply hand rub again and put on sterile gloves over the gown cuffs.
Critical sites (needle, syringe tip, vial septum, opened ampoule neck, bag injection port) must never be touched and must stay in unobstructed first air inside the ISO Class 5 PEC.
Initial qualification requires three gloved fingertip samples with 0 CFU; after the media-fill test, requalification is yearly (low and medium risk) or every 6 months (high risk), at 3 CFU or fewer.
Aseptic Technique, Hand Hygiene & Garbing Protocols
Core Principle: Compounding personnel represent the single greatest source of particulate contamination and microbial shedding in the cleanroom environment. Every minute, the human body sheds 10,000 to 30,000 dead skin squames, millions of respiratory droplets, and transient pathogenic bacteria. Mastering hand hygiene, following a disciplined garbing sequence, preserving critical sites with uninterrupted First Air, and demonstrating competency via gloved fingertip testing are fundamental technical duties of the Canadian pharmacy technician.
1. Cleanroom Microbiology & The Human Contamination Factor
Even healthy, asymptomatic individuals carry vast bacterial populations on skin surfaces, in hair follicles, and in mucous membranes:
- Resident Flora: Microorganisms permanently inhabiting the deeper epidermal layers (e.g., Staphylococcus epidermidis, Micrococcus luteus, Corynebacterium species). They are difficult to eliminate completely and shed continuously with sloughed skin cells.
- Transient Flora: Microorganisms acquired through everyday environmental contact (e.g., Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, fungal spores). They reside in superficial skin oils and can be largely removed with thorough handwashing.
- Respiratory & Salivary Droplets: Normal breathing, speaking, and coughing expel thousands of microscopic liquid droplets laden with Streptococcus species and oral pathogens. Speaking inside an ISO Class 5 workbench is restricted, and coughing or sneezing requires immediately turning away and replacing personal protective equipment (PPE).
2. Hand Hygiene & Garbing Sequence (The Progression from "Dirty" to "Clean")
Under NAPRA Model Standards, garbing must be performed in a precise, logical sequence starting with the dirtiest apparel and progressing toward the cleanest. Garbing occurs in the ante-room, crossing the line of demarcation.
Preliminary Steps (Prior to Entering the Ante-Room)
Before crossing into the cleanroom suite, pharmacy technicians must:
- Remove all personal outer garments (coats, sweaters, cardigans).
- Remove all personal jewelry, watches, rings, bracelets, and body piercings.
- Verify that fingernails are natural, clean, neatly trimmed (under 1/4 inch), and completely free of nail polish, lacquer, or artificial enhancements (acrylic or gel nails harbor opportunistic fungal and bacterial pathogens).
- Remove all makeup, cosmetics, eyelashes, and powdered cosmetics (which shed mineral particulates).
Step-by-Step Garbing Sequence (NAPRA's Recommended Order)
NAPRA requires each pharmacy to document its garbing sequence in its policies and procedures. The order NAPRA recommends is:
| Step | Action & Garbing Item | Technical Rationale & Procedural Detail |
|---|---|---|
| 1 | Hair Cover | On the "dirty" side of the demarcation line, put on a hair cover that encloses all head hair and the ears. |
| 2 | Beard Cover | If facial hair is present, put on a beard cover that encloses it completely. |
| 3 | Face Mask | Put on the face mask and mould the nose clip so exhaled air does not escape toward the work area. Eye protection is added when the task requires it. |
| 4 | Shoe Covers | Put on shoe covers while stepping over the demarcation line, so each covered foot lands on the clean side. Dedicated clean-area shoes are an alternative. |
| 5 | Hand and Forearm Hygiene | Under warm running water, use a nail pick to clean under the fingernails. Wash hands and forearms to the elbows with soap and water for at least 30 seconds (no brushes), rinse, and dry with a disposable lint-free towel. |
| 6 | Alcohol-Based Hand Rub (ABHR) | Apply an ABHR with persistent activity to the hands and forearms and let it evaporate. |
| 7 | Gown | Put on a non-shedding gown that closes at the neck and has elastic cuffs. |
| 8 | ABHR and Sterile Gloves | After entering the clean room, apply ABHR again, let the hands dry, and put on sterile, powder-free gloves pulled over the gown cuffs. |
| 9 | Glove Disinfection | Disinfect gloved hands with sterile 70% isopropyl alcohol and let them dry before touching supplies, and repeat regularly during compounding. |
3. Critical Sites & The Law of "First Air"
In sterile compounding, contamination occurs when microorganisms or particulates contact a critical site.
Definition of a Critical Site
A critical site is any location, opening, or fluid pathway surface that provides a direct pathway between a sterile preparation and the external environment, or any surface that comes into direct contact with the sterile medication pathway.
Detailed Inventory of Critical Sites
- Needles: The bevel tip, bevel heel, stainless steel shaft, and the internal lumen of the needle hub. The only non-critical surface of a needle is the outer plastic protective sheath.
- Syringes: The luer-lock or luer-slip tip, and the internal surface of the barrel. Crucially, the rubber piston ribs of the plunger are critical sites; as the plunger is pulled back and pushed forward, any contamination on the plunger shaft is carried directly into the sterile fluid barrel. Technicians may only touch the flat thumb flange at the very end of the plunger.
- Vials: The center of the rubber septum (stopper) once the protective plastic flip-off cap has been removed.
- Glass Ampoules: The fractured glass neck opening after the ampoule has been snapped open.
- IV Bags: The additive injection port septum (rubber port). The plastic medication port tube may be touched, but the puncturable rubber port face is a critical site.
- Transfer Sets & Spikes: The sharp plastic fluid spike, venting spike, and female luer connections.
First Air Mechanics & Shadowing
- First Air: The pristine, unidirectional air that exits directly from the HEPA filter at 90 fpm, completely free of particulates and microorganisms. First air must continuously wash across every critical site.
- Shadowing (Airflow Disruption): When an object, container, or technician hand is placed between the HEPA filter and a critical site, it blocks First Air. This obstruction creates a turbulent, downstream "dead zone" or wake (a shadow) where room air and shedding particulates are sucked into the critical site.
- In Horizontal LAFW (Air flows back to front): Technicians must never place hands or supplies behind the critical site. Compounding manipulations must be performed with hands positioned to the sides or slightly forward of the critical site.
- In Vertical LAFW / BSC (Air flows top to bottom): Technicians must never place hands or supplies directly above the critical site. Needles and vials must be held horizontally or at an angle so that overhead First Air falls unobstructed directly onto the septum and needle.
4. Ergonomics & Work Practices Inside the ISO Class 5 PEC
To prevent air turbulence from pulling lower-quality cleanroom air into the workbench, technicians must observe precise spatial boundaries and movement rules.
Spatial Placement in the PEC
- At Least 6 Inches Inside: Standard aseptic-technique training places all manipulations at least 6 inches (15 cm) inside the front edge of a laminar airflow workbench, away from the turbulent zone where room air mixes with the HEPA-filtered air.
- Keep Clear of the Filter and Walls: Never place items against the HEPA filter face, and keep supplies away from the side walls so first air reaches each critical site. Follow the PEC manufacturer's instructions and your pharmacy's procedures for exact spacing.
Cleanroom Layout & Supply Management
- Zone Separation: Organize supplies linearly: "clean/staged items" on one side, "active compounding manipulation zone" in the center, and "completed products and waste" on the opposite side.
- Minimal Supplies: Bring only the supplies needed for the current preparation into the PEC, so unidirectional air can sweep the work area without eddies.
- No Non-Sterile Objects: Never place pens, calculation scratchpads, cardboard packaging, paper order forms, or cell phones inside the PEC. Outer protective packaging (plastic overwrap on IV bags and syringes) must be removed outside the PEC or wiped with sterile 70% IPA before entry.
Sanitizing Critical Septa
- When removing the plastic flip-top cap from a commercial vial, the rubber septum beneath is clean but not sterile.
- Technicians must wipe the rubber septum with a sterile 70% IPA swab using a firm, single wiping stroke in one direction (never back and forth, which redeposits particles).
- Allow the alcohol to air dry completely (minimum 10 to 15 seconds) before puncturing. Puncturing a wet stopper carries liquid alcohol into the vial, which can chemically degrade the drug and cause hemolysis or vein irritation.
5. Personnel Competency: Gloved Fingertip Sampling & Media-Fill Testing
Under NAPRA standards, sterile compounding competency cannot be assumed based on written testing alone; it must be empirically validated through microbiological sampling.
Gloved Fingertip and Thumb Sampling (GFT)
Gloved fingertip sampling verifies that a pharmacy technician can complete the garbing and hand hygiene sequence without contaminating their sterile gloves.
- Initial Qualification Protocol:
- Conducted immediately after garbing and donning sterile gloves, without applying sterile 70% IPA to the gloves (using alcohol would mask poor hygiene and invalidate the test).
- The technician gently presses the pads of all five digits (four fingers and thumb) of both hands onto nutrient agar plates (TSA with lecithin and polysorbate 80).
- Must be performed and successfully passed on three separate, consecutive occasions.
- Passing Criterion: Exactly 0 Colony-Forming Units (CFUs) on both hands across all three tests.
- Ongoing Requalification:
- Conducted at least annually for low- and medium-risk compounding, and at least every 6 months for high-risk compounding (NAPRA).
- Performed inside the PEC at the conclusion of a media-fill test. The technician touches agar plates before removing gloves.
- Passing Criterion: A total of ≤ 3 CFUs for both hands combined.
Media-Fill Testing (MFT) / Aseptic Process Simulation
Media-fill testing evaluates a technician's real-world physical aseptic technique under worst-case operational stress.
- Testing Procedure: The technician simulates complex compounding procedures using sterile, nutrient-rich Soybean-Casein Digest Medium (Tryptic Soy Broth [TSB]) instead of actual drug solutions. The simulation incorporates multiple needle punctures, ampoule fractures, syringe transfers, and filter maneuvers.
- Incubation Protocol:
- The sealed containers (vials, IV bags) are incubated at 20°C to 25°C for 7 days, followed by 30°C to 35°C for 7 days (or vice versa, total 14 days).
- Passing Criterion: Must exhibit zero visible turbidity (0 CFUs) at the end of the 14-day incubation period. Any cloudiness, pelicle formation, or particulate growth indicates microbial contamination and constitutes failure.
- Corrective Action: The technician is immediately suspended from sterile compounding duties, undergoes targeted retraining, and must pass three consecutive GFT tests and a fresh media-fill test before returning to practice.
A pharmacy technician is preparing an intravenous vancomycin infusion inside a vertical laminar airflow Biological Safety Cabinet (BSC). While reconstituting the vancomycin vial, the technician places their gloved hand directly above the rubber septum of the vial to steady it. What is the technical evaluation of this action?
Acceptable technique, because vertical airflow moves air horizontally toward the front sash
Acceptable technique, provided the technician sanitized their gloves with sterile 70% IPA within the last 15 minutes
Unacceptable technique, because the technician must always work outside the hood when puncturing vials to protect the HEPA filter
Unacceptable technique, because placing a hand directly above the vial septum disrupts First Air coming down from the ceiling HEPA filter, creating a turbulent contamination shadow over the critical site
A pharmacy technician candidate is undergoing initial practical qualification for sterile compounding under NAPRA Model Standards, which includes the gloved fingertip and thumb sampling procedure. What are the specific testing conditions and passing criteria?
The candidate must complete three consecutive fingertip samplings immediately after garbing without using alcohol hand rub, with each test yielding exactly 0 colony-forming units (CFUs)
The candidate must achieve fewer than 10 CFUs on a single test conducted after completing a 4-hour compounding shift
The candidate must apply sterile 70% IPA to gloves immediately before touching the agar plates, achieving less than 5 CFUs
The candidate is only required to perform gloved fingertip sampling once every two years after initial employment
A pharmacy technician is preparing to enter the clean room suite to compound sterile intravenous admixtures. Which sequence follows the garbing order recommended in NAPRA's Model Standards for non-hazardous sterile compounding?
Don sterile gloves, then gown, then shoe covers, then mask and hair cover, then wash hands for 10 seconds
Wash hands and forearms for 10 seconds, then gown, then hair cover, then shoe covers, then sterile gloves
Hair cover, beard cover and face mask on the dirty side; shoe covers while stepping over the line; wash hands and forearms for at least 30 seconds; alcohol hand rub; gown; then, in the clean room, hand rub and sterile gloves over the cuffs
Gown, then face mask, then wash hands with cold water, then shoe covers, then non-sterile examination gloves
Sections you finish are checked off in the contents.