Isolation Gown Levels Explained: AAMI Level 1 vs Level 2 vs Level 3

Monday morning, and the procurement spreadsheet is open again. A purchasing lead for a Canadian clinic network is choosing isolation gowns for three units at once: a walk-in clinic, an ICU where staff draw blood and suture lines, and an emergency department where trauma cases arrive without warning. One vendor catalog lists AAMI Level 2; another says Level 3. The difference between those labels decides how much protection a nurse actually has when fluids are involved — and what the facility pays per case.

ANSI/AAMI PB70 is the North American standard that classifies the liquid barrier performance of gowns used in healthcare. It defines four protection levels, each based on how a gown performs in laboratory tests for water impact penetration, water penetration, and hydrostatic pressure. Understanding those levels is a procurement skill in its own right, because the right gown depends on the task and the exposure risk, not the label.

What AAMI Levels Actually Measure

The core idea behind PB70 is that a gown is a barrier with critical zones — the front torso and the sleeves — where most fluid contact happens during patient care. A gown’s level reflects how well those zones resist liquid strike-through under controlled test conditions. Levels are not rankings of quality: a Level 1 gown is built for a different set of tasks than a Level 3 gown. Selecting the right level means matching the barrier to the anticipated fluid exposure.

How do AAMI Level 1, 2, 3 and 4 differ?

The table below summarizes the four levels under ANSI/AAMI PB70 and the settings where each is typically used.

Notice what is not in the table: brand names, price points, or subjective claims. AAMI levels are technical classifications. What changes between levels is the barrier performance itself, and that is what should drive the specification.

Why does Level 2 cover most routine procedures?

Level 2 is the workhorse of acute care. Blood draws, IV starts, suturing, wound care, and ICU nursing all involve low but real fluid exposure, and a Level 2 gown covers them comfortably. Our AAMI Level 2 isolation gowns are built for exactly this range of tasks.

The CliniEco Medical Isolation Gown is an SMMS 40gsm, single-use gown rated for AAMI Level 2 protection, with its critical zones reinforced to the rated barrier level. SMMS stands for spunbond-meltblown-meltblown-spunbond, a four-layer fabric construction that balances barrier performance with breathability. At 40 gsm the fabric is light enough to wear through a full shift, yet consistent enough for routine fluid exposure.

Because these gowns are single-use, there is no reprocessing cycle to track and no laundering that could degrade the barrier over time. Each gown is discarded after one patient interaction, consistent with standard infection control practice.

For Canadian buyers, one more point matters: medical gowns sold here fall under Health Canada’s oversight as medical devices, and barrier selection should follow the guidance of the Public Health Agency of Canada (PHAC) and the CDC, which tie gown level to the procedure being performed.

What should you evaluate when selecting a gown?

Use this checklist when evaluating gowns for your facility:

• Task and fluid exposure. Match the AAMI level to the procedure: Level 1 for basic care and visitor use, Level 2 for blood draw, suturing, and ICU care, Level 3 for arterial blood draw, trauma, and the ER, Level 4 for surgery and splash-heavy procedures.
• Volume and pressure of fluid. A slow soak and a pressurized splash are different risks; higher levels handle larger volumes and higher pressure.
• Duration of wear. For long shifts, breathability matters. SMMS isolation gowns balance barrier performance with comfort.
• Critical zone coverage. Confirm the front torso and sleeves are reinforced to the rated level, not just the overall fabric.
• Single-use vs reusable. Single-use gowns remove reprocessing costs and eliminate barrier degradation from repeated laundering.
• Regulatory fit and cost per procedure. Confirm the product is authorized for sale in Canada, and remember that a Level 2 gown used where Level 1 would suffice is wasted budget, while a Level 1 gown used for blood draws is a safety gap.

How do you build a gown inventory that matches your units?

Back to Monday’s spreadsheet. The practical answer for most facilities is a mix: Level 1 for visitor and basic care use, Level 3 for trauma bays and the ER, and a dependable supply of Level 2 for everything in between. The CliniEco Medical Isolation Gown (50-pack) gives you a consistent, single-use Level 2 option that covers phlebotomy, suturing, and ICU care without over-specifying.

Isolation gown selection does not have to be complicated once the levels are clear. Match the barrier to the task, follow the standard, and your staff gets the protection each procedure actually demands.

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Frequently Asked Questions

What does an AAMI Level 2 gown protect against?

ANSI/AAMI PB70 classifies gowns by the liquid barrier performance of their critical zones, the front torso and the sleeves. A Level 2 gown is tested for water impact penetration and hydrostatic pressure at the low-exposure tier, which suits routine procedures such as blood draws, suturing and general clinical care where fluid contact is limited.

What is the difference between AAMI Level 1, 2 and 3 isolation gowns?

The levels describe increasing fluid resistance in the critical zones, tested under ANSI/AAMI PB70. Level 1 covers minimal fluid exposure such as standard isolation and patient transport; Level 2 suits routine procedures with low fluid exposure; Level 3 is for moderate to higher fluid exposure. They are task-specific categories, not a quality ranking.

Is a higher AAMI level always the right choice for a clinic?

Not necessarily. A higher level usually costs more and can be warmer to wear, so matching the barrier to the task keeps both protection and budget sensible. A purchasing team should map each unit's exposure, comparing a walk-in clinic room with an emergency department, and choose the level that fits the expected fluid contact.

Which isolation gown should a Canadian clinic stock?

Facilities commonly stock a Level 2 gown as the workhorse and keep higher-level gowns for higher-exposure areas. CliniEco Medical offers an SMS 40 gsm Level 2 isolation gown built for routine clinical use, alongside Level 1 disposable gowns for lower-exposure tasks.

Related reading: explore our infection control resources for clinics.

decode HAI, SSI, CJD and MDRO acronyms in our infection control pillar article.