Kingphar Medical Group

New's

3/6 2026

Non-Woven Series · Protective Apparel

Isolation Gown:
AAMI Level 1–4 Decoded,
Materials and Procurement Guide

Q: What is the difference between an isolation gown and a surgical gown?

The critical difference is the protective zone and sterility requirement. An isolation gown's critical zone is the entire gown — front, back, and seams — providing 360-degree barrier performance. Isolation gowns can be sterile or non-sterile. A surgical gown's critical zone covers only the front and sleeves (the areas closest to the sterile field); the back has no barrier requirement. Surgical gowns must be sterile. Both can be rated AAMI Level 1–4, but they protect different areas of the body. For standard infection control and patient care, isolation gowns are used. For procedures requiring a sterile field, surgical gowns are required.

Q: What do AAMI Levels 1, 2, 3, and 4 mean for isolation gowns?

AAMI levels are defined by ANSI/AAMI PB70:2012 and classify gowns by liquid barrier performance. Level 1 (minimal risk): basic care, standard isolation, visitor gowns, standard medical units — minimal fluid exposure expected. Level 2 (low risk): blood draws, suturing, ICU, pathology lab — some fluid splatter possible. Level 3 (moderate risk): arterial blood draw, IV insertion, emergency room, trauma cases — significant fluid exposure expected. Level 4 (highest risk): major surgery, high fluid penetration risk, bloodborne pathogen exposure — must pass viral penetration test (ASTM F1671). Levels 1–3 are tested with water; Level 4 is the only level tested against viral penetration and bloodborne pathogens.

Q: What material is an isolation gown made from?

Isolation gowns are made from several non-woven materials depending on the AAMI level required. PP (polypropylene) spunbond at 25 GSM is used for basic Level 1 gowns. SMS (Spunbond-Meltblown-Spunbond) at 25–40 GSM is the most widely specified material for Level 1–3 gowns, providing a balance of fluid resistance and breathability. CPE (cast polyethylene) film provides higher waterproofing for Level 2–3 applications. PP+PE composite materials are used for Level 3–4 gowns requiring enhanced barrier performance.

Q: What AAMI level isolation gown should a hospital emergency department use?

Hospital emergency departments should use AAMI Level 3 isolation gowns as their standard. Emergency room procedures — including trauma care, arterial blood draw, IV insertion, and wound management — fall into the 'moderate risk' category that Level 3 addresses. Level 2 is insufficient for ED use where unexpected fluid exposure is common. Level 4 is reserved for major surgical procedures and is typically used in operating rooms rather than emergency departments. A common procurement approach for EDs is to stock Level 3 as the standard and keep Level 4 available for specific high-risk cases.

A complete reference for hospital procurement teams and distributors: clarifying the AAMI level system, comparing isolation gowns versus surgical gowns, covering PP, SMS, and CPE material selection, and providing bulk procurement specifications for healthcare facilities and GCC health authorities.

AAMI Level 1 · 2 · 3 · 4 PP · SMS · CPE · PP+PE 25–40 GSM Sterile & Non-Sterile Universal S–3XL CE / FDA / ISO 13485

Albar

Content Auditor & Content Operations · Kingphar Medical

LinkedIn More Articles

Standard

AAMI PB70

ANSI/AAMI PB70:2012

Protection Levels

Minimal to viral barrier

Main Material

SMS

Spunbond-Meltblown-Spunbond

GSM Range

25–40

g/m² by protection level

Section 01 · The First Questions

Isolation Gown vs Surgical Gown — and What Do AAMI Levels Actually Mean?

Every isolation gown procurement starts with the same two questions. Getting them wrong means either under-protecting staff or spending unnecessarily on over-specified product. This section answers both before we get to specifications.

Isolation Gown vs Surgical Gown

These two products look similar in a catalogue photo but serve different clinical functions and have different critical zone requirements under AAMI standards.

Feature	Isolation Gown	Surgical Gown
Critical zone	Entire gown — front, back, and seams	Front and sleeves only; back may be non-protective
Sterility	Sterile or non-sterile	Must be sterile
Primary use	Infection control, patient care, isolation precautions	Sterile field procedures, surgery
AAMI level range	Level 1–4	Level 1–4
Back protection	Required — full barrier	Not required
Typical settings	Medical wards, ICU, ED, clinics, isolation rooms	Operating rooms, sterile procedure rooms

Key Procurement Implication

For routine hospital ward use, patient transfers, blood draws, and general isolation procedures: specify isolation gowns. For surgical procedures requiring a sterile field: specify surgical gowns. Many hospitals maintain both product types with separate line items in their procurement contracts.

The AAMI Level System

ANSI/AAMI PB70:2012 is the standard that classifies isolation gowns and surgical gowns by their liquid barrier performance. The four levels reflect increasing resistance to fluid penetration and increasingly stringent test requirements.

Section 02 · AAMI Levels 1–4

Which Level Does Your Clinical Setting Require?

1
Minimal Risk
Basic Care & Standard Isolation
Standard medical units, visitor gowns, basic patient care where minimal fluid exposure is expected. No splash or spray anticipated. Light barrier performance.
Test: AATCC 42 spray impact only
2
Low Risk
Blood Draws, Suturing, ICU
Blood draws, suturing, ICU patient care, pathology laboratory work. Some fluid splatter possible; moderate barrier performance required.
Test: AATCC 42 + AATCC 127 (50 cm H₂O)
3
Moderate Risk
Emergency Room, Trauma, Arterial Lines
Arterial blood draw, IV insertion, emergency room, trauma cases, moderate fluid exposure expected. Significant fluid resistance required. Most hospital EDs should stock Level 3 as standard.
Test: AATCC 42 + AATCC 127 (50 cm H₂O, more rigorous)
4
Highest Risk
High-Risk Surgery, Bloodborne Pathogen Exposure
Major surgery, high fluid penetration risk, bloodborne pathogen exposure. Only AAMI Level 4 is tested against viral penetration. The only level that addresses bloodborne pathogen protection.
Test: ASTM F1671 — viral penetration (simulated blood + virus)

Critical Distinction: Level 4 Is the Only Viral Barrier

AAMI Levels 1, 2, and 3 are tested with water only. Because blood has lower surface tension than water, blood can penetrate Level 1–3 gowns more readily than test results suggest. No correlation exists between Level 1–3 water resistance and viral penetration protection. For procedures with genuine bloodborne pathogen risk, only Level 4 provides verified viral barrier performance. This distinction is often misunderstood in procurement specifications that assume Level 3 provides "nearly the same" protection as Level 4 — it does not.

Section 03 · Material Selection

PP, SMS, CPE, and PP+PE — Choosing the Right Fabric

The material of an isolation gown determines its barrier performance, breathability, and comfort during extended wear. Different materials are appropriate for different AAMI levels and use scenarios.

Level 1 · Basic

PP Spunbond (25 GSM)

Single-layer polypropylene spunbond. Lightweight and economical. Appropriate for minimal fluid exposure — visitor gowns, standard ward use. Breathable but offers only basic barrier performance. Most economical option.

Level 1–3 · Industry Standard

SMS (Spunbond-Meltblown-Spunbond)

Three-layer non-woven: outer and inner spunbond polypropylene for strength and softness, middle meltblown polypropylene for fluid barrier. The standard material for most disposable isolation gowns. Available at 25 GSM (Level 1–2), 30–35 GSM (Level 2), and 40 GSM (Level 3). Balance of barrier performance, breathability, and cost.

Level 2–3 · High Waterproofing

CPE (Cast Polyethylene Film)

Cast polyethylene film at 25g provides superior waterproofing versus SMS. Higher fluid resistance but less breathable than SMS — suitable for shorter procedures or when maximum fluid resistance is required at Level 2–3. Common in rapid-use healthcare settings and food processing applications.

Level 3–4 · Maximum Protection

PP+PE Composite / Anti-Static

Polypropylene spunbond coated with polyethylene film, or anti-static PP fabric with PE breathable backing. Provides the enhanced barrier performance required for Level 3–4 certification. Used in high-risk surgical procedures and settings with bloodborne pathogen exposure risk.

GSM Guide for Material Selection

GSM	Material	AAMI Level	Typical Application
25 GSM	PP Spunbond or SMS	Level 1–2	Basic ward care, visitor gowns, blood draws
30 GSM	SMS	Level 2	ICU, suturing, pathology
35 GSM	SMS	Level 2–3	ICU, moderate fluid exposure
40 GSM	SMS or PP+PE	Level 3	ED, trauma, arterial lines
Variable	PP+PE / Anti-static	Level 4	High-risk surgery, bloodborne pathogen risk

Section 04 · Design Features

Construction Features That Affect Clinical Performance

Beyond material and AAMI level, several construction details affect how well an isolation gown performs in clinical use and how comfortable it is during extended wear.

Cuff Design

Knit cuffs — elastic knit wrist cuffs conform to the wearer's wrist and prevent gown sleeves from riding up during patient care. The most common design in hospital isolation gowns.
Elastic cuffs — elastic band at the wrist without knit structure. Provides a seal but less comfortable during extended wear.
Thumbhole / open cuff — sleeves with a thumbhole allow the wearer to anchor the sleeve to the thumb for secure positioning. Common in CPE gowns.

Closure and Fastening

Back tie — standard for most isolation gowns. Ties at the neck and waist allow adjustable fit. The back can be opened for easy removal without contaminating the front.
Neck snap/velcro — faster to don and doff in high-turnover settings.

Sizing

Standard isolation gowns are available in universal sizing Small through 3XL with adjustable neck ties and waist ties accommodating a broad range of body sizes. Universal-fit gowns (one size fits most) are common in bulk hospital procurement for emergency settings where sizing in advance is impractical.

Hospital Medical Wards Intensive Care Unit (ICU) Emergency Department Isolation Rooms Blood Draw / Phlebotomy Pathology Laboratory Patient Transfer Infection Control Dental Procedures Pharmacy / Clean Room Veterinary Use Industrial / Food Processing

Sourcing Isolation Gowns for Hospital or Distributor Tender?

Kingphar Medical supplies AAMI Level 1–4 isolation gowns in PP, SMS, and CPE materials, sterile and non-sterile, with CE / FDA / SFDA documentation for GCC health authority tenders.

Request Samples or Quote View Product Page

Section 05 · Standards & Compliance

Regulatory Framework by Market

Standard	Market	Scope
ANSI/AAMI PB70:2012	United States	Level 1–4 liquid barrier performance for isolation and surgical gowns
EN 13795	European Union	Surgical gowns and drapes — performance requirements
EN 14126	European Union	Protective clothing against infective agents
ISO 13485	Global	Quality management system — manufacturer certification
CE Mark (MDR 2017/745)	EU / EEA	Class I or Class IIa depending on gown type and level
FDA 510(k) / EUA	United States	Required for US market isolation gown supply
SFDA	Saudi Arabia / GCC	Medical device registration for GCC market
GB 19082	China domestic	Technical requirements for surgical protective clothing

Documentation Required for Hospital Tender

AAMI Level certification with test report (AATCC 42, AATCC 127 for Level 1–3; ASTM F1671 for Level 4)
ISO 13485 certificate
CE Declaration of Conformity
FDA registration (for US market)
SFDA registration certificate (for GCC market)
Material safety data sheet (MSDS)
Biocompatibility test report (ISO 10993, for skin-contact materials)

Section 06 · Procurement Strategy

Full Specifications and OEM Options

Parameter	Specification
AAMI levels available	Level 1 · Level 2 · Level 3 · Level 4
Materials	PP Spunbond · SMS · CPE · PP+PE composite
Fabric weight (GSM)	25, 30, 35, 40 GSM (material and level dependent)
Critical zone	Full-body (isolation) or front+sleeves (surgical) per AAMI PB70
Cuff options	Knit cuff · Elastic cuff · Thumbhole
Closure	Back tie (neck + waist) · Snap · Velcro
Sizing	S / M / L / XL / 2XL / 3XL · Universal fit
Colors	Blue · White · Yellow · Custom
Sterile	Available (EO or gamma) · Non-sterile standard
Standard packaging	10–50 per bag · 100–200 per case
Latex-free	Yes

OEM Customization

AAMI level and material specification
GSM selection within material type
Cuff design: knit, elastic, thumbhole
Closure: back tie, snap, velcro
Size range specification
Color: blue, white, yellow, or custom
Private-label packaging and carton
Arabic / bilingual labelling for GCC
Sterile or non-sterile presentation
Minimum order: 500 units standard; 5,000 units for custom OEM

FAQ · Procurement Questions Answered

What Healthcare Buyers Ask

What is the difference between an isolation gown and a surgical gown?

The critical difference is the protective zone. An isolation gown's critical zone is the entire gown — front, back, and seams — providing 360-degree barrier performance. Isolation gowns can be sterile or non-sterile. A surgical gown's critical zone covers only the front and sleeves; the back has no barrier requirement, and surgical gowns must be sterile. For standard infection control and patient care, use isolation gowns. For procedures requiring a sterile field, use surgical gowns.

What do AAMI Levels 1, 2, 3, and 4 mean?

AAMI levels classify gowns by liquid barrier performance. Level 1 (minimal risk): basic care, visitor gowns. Level 2 (low risk): blood draws, suturing, ICU. Level 3 (moderate risk): arterial blood draw, IV insertion, emergency room, trauma. Level 4 (highest risk): major surgery, bloodborne pathogen exposure — the only level tested against viral penetration using ASTM F1671. Levels 1–3 are tested with water only and cannot be assumed to provide viral protection.

What material is an isolation gown made from?

Isolation gowns are made from non-woven materials: PP spunbond (25 GSM, Level 1), SMS (Spunbond-Meltblown-Spunbond, 25–40 GSM, Level 1–3), CPE film (Level 2–3), and PP+PE composite (Level 3–4). SMS is the industry standard for most disposable isolation gowns, balancing fluid resistance, breathability, and cost. Higher GSM SMS provides better protection.

What AAMI level should a hospital emergency department use?

Hospital emergency departments should use AAMI Level 3 as their standard. ED procedures including trauma care, arterial blood draw, and wound management fall into the moderate risk category Level 3 addresses. Level 2 is insufficient for ED use where unexpected fluid exposure is common. Level 4 is reserved for major surgical procedures with bloodborne pathogen risk.

What is SMS fabric in isolation gowns?

SMS stands for Spunbond-Meltblown-Spunbond — a three-layer non-woven fabric. The outer and inner layers are spunbond polypropylene for strength and softness; the middle layer is meltblown polypropylene acting as a fluid barrier. SMS is the industry standard for Level 1–3 disposable isolation gowns because it balances barrier performance, breathability for extended wear, and cost efficiency. Higher GSM SMS (35–40 GSM) provides better protection than lighter versions (25 GSM).

Build Your Isolation Gown Specification

Kingphar Medical supplies AAMI Level 1–4 isolation gowns in PP, SMS, and CPE materials with CE / FDA / SFDA documentation. OEM customization and GCC health authority tender support available. Non-sterile bulk from 500 units; sterile from 100 units.