10.1 Infection Control Risk Assessment (ICRA) Matrix & Environmental Containment
Key Takeaways
- A multidisciplinary Infection Control Risk Assessment (ICRA) is a proactive clinical risk mitigation process mandated by ASHE, CDC, APIC, and FGI Guidelines prior to initiating any healthcare renovation, demolition, or construction project.
- Construction activities are categorized into four distinct types (Type A through Type D) based on dust generation potential, mechanical invasiveness, and the duration of structural disruption.
- Patient populations and clinical areas are stratified into four vulnerability Risk Groups (Low, Medium, High, and Highest Risk) based on immunocompetence, invasive device usage, and susceptibility to opportunistic fungal pathogens such as Aspergillus.
- The ICRA Precautions Matrix cross-references Construction Activity Types with Patient Risk Groups to establish the mandatory Class of Precautions (Class I through Class IV) required for environmental containment.
- EVS leadership serves as an essential stakeholder on the multidisciplinary ICRA committee, conducting daily containment audits, monitoring barrier integrity, managing ante-room hygiene, and executing terminal commissioning cleaning.
10.1 Infection Control Risk Assessment (ICRA) Matrix & Environmental Containment
Healthcare construction, renovation, and maintenance activities present significant airborne infection hazards to vulnerable patient populations. Demolition of drywall, disturbance of ceiling plenums, and disruption of ductwork release massive quantities of microscopic fungal spores—predominantly Aspergillus species (Aspergillus fumigatus, Aspergillus flavus, and Aspergillus niger)—as well as other environmental molds and bacterial particulates. While healthy individuals tolerate ambient fungal spores with minimal risk, inhalation of aerosolized Aspergillus conidia by severely immunocompromised patients (such as bone marrow transplant recipients, leukemic patients, or solid organ transplant patients) can lead to invasive pulmonary aspergillosis, a severe healthcare-associated infection carrying mortality rates between 50% and 90%.
To prevent construction-associated healthcare-acquired infections (HAIs), the Infection Control Risk Assessment (ICRA) was developed as a multidisciplinary, proactive risk-management framework. Endorsed and standardized by the American Society for Health Care Engineering (ASHE), the Centers for Disease Control and Prevention (CDC), the Association for Professionals in Infection Control and Epidemiology (APIC), and the Facility Guidelines Institute (FGI), the ICRA matrix governs every physical alteration within a healthcare facility. For the Certified Health Care Environmental Services Professional (CHESP), mastering ICRA principles is crucial for protecting patients, managing departmental resources, and maintaining regulatory compliance with The Joint Commission (TJC) Environment of Care (EC) standards.
1. The Multidisciplinary ICRA Planning Committee
An effective ICRA is not created in isolation by facility engineers or outside general contractors. Regulatory standards mandate that an ICRA must be established by a collaborative, multidisciplinary team before any physical construction begins, bids are finalized, or containment barriers are erected.
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| MULTIDISCIPLINARY ICRA COMMITTEE STRUCTURE |
| |
| [ INFECTION PREVENTION (CIC) ] <---> [ EVS LEADERSHIP (CHESP) ] |
| - Clinical risk stratification - Post-construction cleaning SOPs |
| - Surveillance & bio-monitoring - Barrier & anteroom maintenance |
| - Patient relocation protocols - Waste transit & floor care |
| |
| [ FACILITIES & PLANT OPS ] <---> [ GENERAL CONTRACTOR / PM ] |
| - HVAC isolation & balancing - Phasing schedules & dust control |
| - Negative pressure engineering - Subcontractor ICRA compliance |
| - Plumbing & utility isolation - Daily containment maintenance |
| |
| [ SAFETY / INDUSTRIAL HYGIENE ] <---> [ CLINICAL UNIT LEADERSHIP ] |
| - Noise, vibration & air quality - Patient care continuity |
| - Interim Life Safety Measures (ILSM) - Clinical workflow adjustments |
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EVS Leadership Operational Responsibilities
The CHESP and EVS leadership team fulfill several critical operational functions within the ICRA lifecycle:
- Pre-Construction Planning: Reviewing project phasing plans, defining designated material transport routes (elevators and corridors), and establishing waste disposal pathways to prevent cross-contamination of clean clinical environments.
- Barrier & Ante-room Maintenance: Inspecting containment barriers for physical integrity, verifying that walk-off tacky mats are positioned correctly and peeled regularly, and ensuring ante-room transition spaces remain clean.
- Adjacent Area Environmental Hygiene: Increasing the frequency of damp dusting, floor scrubbing, and HEPA vacuuming in corridors, nurse stations, and clinical rooms immediately adjacent to active construction zones.
- Post-Construction Commissioning Cleaning: Planning, staffing, and executing the multi-phase commissioning clean (rough clean, deep clean, and terminal clinical disinfection) prior to patient occupancy.
2. Construction Activity Types (Scope & Dust Generation)
The ICRA framework classifies all construction, renovation, and maintenance work into four distinct Construction Activity Types based on the magnitude of dust generation, structural invasiveness, and project duration.
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| ICRA CONSTRUCTION ACTIVITY TYPES (A - D) |
| |
| [ TYPE A: INSPECTION & NON-INVASIVE ] |
| - Visual inspections, removing 1-2 ceiling tiles for inspection only |
| - Painting (no sanding), minor electrical trim, wall covering touch-ups |
| |
| [ TYPE B: SMALL SCALE, SHORT DURATION, MINIMAL DUST ] |
| - Cutting walls/ceilings where dust can be strictly controlled |
| - Cabling installation, access to chase spaces, minor plumbing repairs |
| - Work completed within a single work shift |
| |
| [ TYPE C: MODERATE TO HIGH DUST OR DEMOLITION OF COMPONENTS ] |
| - Sanding drywall, removing floor coverings (VCT/carpet), ceiling tiles |
| - New wall construction, minor ductwork or electrical work in ceilings |
| - Multi-shift projects generating substantial particulate loads |
| |
| [ TYPE D: MAJOR DEMOLITION & HEAVY CONSTRUCTION ] |
| - Heavy structural demolition, multi-room renovations, new building wings|
| - Complete HVAC system replacement, major utility shaft work |
| - Consecutive multi-day/multi-week major construction projects |
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3. Patient Vulnerability Risk Groups
Simultaneously, hospital environments and patient populations are categorized into four Patient Risk Groups based on immunological vulnerability, invasiveness of clinical care, and the severity of clinical consequences if opportunistic pathogen exposure occurs.
Risk Group Breakdown
- Group 1: Low Risk
- Non-patient administrative areas, executive offices, physical plant rooms, staff locker rooms, exterior grounds, and public non-clinical corridors.
- Group 2: Medium Risk
- Outpatient diagnostic clinics, cardiology, radiology / diagnostic imaging, physical therapy, respiratory therapy, nuclear medicine, admission/discharge lounges, and non-invasive recovery areas.
- Group 3: High Risk
- Emergency Department (ED), Labor & Delivery (L&D), surgical step-down units, pediatrics, inpatient medical-surgical units, post-anesthesia care units (PACU), pharmacy admixture rooms, and outpatient surgery centers.
- Group 4: Highest Risk (Critical Vulnerability)
- Bone Marrow Transplant (BMT) units, Hematology/Oncology wards, solid organ transplant units, Intensive Care Units (ICU, CCU, NICU, PICU), Burn units, Operating Rooms (ORs), Sterile Processing Departments (SPD), Airborne Infection Isolation Rooms (AIIR), and Cardiac Catheterization Labs.
4. Construction Activity Types & Patient Risk Groups Matrix
| Classification Category | Core Operational Definition | Clinical / Physical Examples | Primary Dust & Infection Hazard |
|---|---|---|---|
| Type A: Inspection | Non-invasive, visual, or cosmetic work; zero to minimal dust generated. | Removing 1–2 ceiling tiles for inspection; painting without sanding; electrical fixture trim. | Negligible particulate release; localized spore exposure if ceiling plenum is disturbed. |
| Type B: Minor Invasive | Small scale, short duration work; minimal dust; controlled in 1 shift. | Installing telecom data cabling; cutting small drywall openings (<2 sq ft); minor pipe repair. | Minor localized drywall dust and settled plenum mold spores. |
| Type C: Moderate/High | Work generating moderate to high dust; component removal; multi-shift. | Drywall sanding; pulling carpet/tile; minor ductwork removal; framing new partition walls. | Significant aerosolization of Aspergillus spores and respirable crystalline silica. |
| Type D: Major Demolition | Large-scale demolition, structural remodeling, major HVAC overhaul. | Multi-room gutting; building additions; major mechanical shaft removal; complete flooring demo. | Massive, sustained environmental spore loading; pressure gradient collapse risks. |
| Group 1: Low Risk | Non-patient care spaces; administrative and support zones. | Accounting offices, HR department, physical plant, staff dining rooms, boardrooms. | Lowest patient infection risk; nuisance dust and occupational comfort concerns. |
| Group 2: Medium Risk | Ambulatory care, non-invasive diagnostic, and therapeutic zones. | Diagnostic radiology, echocardiography, outpatient PT/OT, general outpatient exam rooms. | Moderate risk of respiratory irritation in sensitive ambulatory patients. |
| Group 3: High Risk | Acute inpatient care, procedural areas, and invasive support. | Medical-Surgical units, Emergency Department, Pediatrics, L&D suites, Pharmacy cleanrooms. | Risk of wound infection, central line contamination, and respiratory illness. |
| Group 4: Highest Risk | Severely immunocompromised populations and sterile surgical suites. | Oncology/BMT units, Burn units, ICUs, Operating Rooms, Sterile Processing (SPD), AIIRs. | High risk of fatal invasive aspergillosis and surgical site infections (SSIs). |
5. The Master ICRA Precautions Matrix (Classes I – IV)
By cross-referencing the Construction Activity Type (A–D) with the Patient Risk Group (Low–Highest), the ICRA matrix determines the mandatory Class of Precautions (Class I, II, III, or IV) required to execute the project safely.
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| MASTER ICRA PRECAUTIONS MATRIX |
| |
| PATIENT RISK GROUP | TYPE A TYPE B TYPE C TYPE D |
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| LOW RISK GROUP | CLASS I CLASS II CLASS II CLASS III/IV|
| MEDIUM RISK GROUP | CLASS I CLASS II CLASS III CLASS IV |
| HIGH RISK GROUP | CLASS I CLASS II CLASS III/IV CLASS IV |
| HIGHEST RISK GROUP | CLASS II CLASS III/IV CLASS IV CLASS IV |
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Required Precautions by Containment Class
| ICRA Class | Required Engineering Controls & Barrier Types | Dust Suppression & Air Handling Requirements | EVS Waste Transit & Post-Work Cleaning Protocols |
|---|---|---|---|
| Class I | Non-critical minor containment; execute work using methods that minimize dust generation. | Immediately replace displaced ceiling tiles upon completion of visual inspection. | Immediate damp wiping of localized work surfaces; no specialized containment or ante-room required. |
| Class II | Active dust suppression; seal unused doors with duct tape; block/seal air supply/return diffusers. | Water misting of surfaces during cutting; adhesive walk-off tacky mats at work access points. | Wipe work surfaces with EPA-registered disinfectant; transport waste in tightly covered carts; wet mop floor. |
| Class III | Impervious critical barriers (flame-retardant poly or rigid modular panels) sealed floor to deck. | Continuous negative air pressure (≥ -0.01" to -0.03" WG); HEPA air filtration; ante-room constructed. | Vacuum work area with HEPA-filtered vacuum; damp wipe surfaces; EVS executes terminal deep clean before barrier removal. |
| Class IV | Airtight rigid modular or drywall containment sealed floor to roof deck; sealed pass-throughs. | Continuous negative air with alarming digital manometers; dedicated ante-room airlock with HEPA filtration. | Personnel HEPA vacuum clothing before leaving ante-room; sealed waste containers; comprehensive 3-phase EVS commissioning clean. |
A hospital facilities team is planning to cut into drywall partitions to install a new medical gas line within an active Bone Marrow Transplant (BMT) unit. According to the ASHE/CDC ICRA Precautions Matrix, what Construction Activity Type and Patient Risk Group classification apply, and what minimum Class of Precautions must be implemented?
Which opportunistic environmental pathogen poses the MOST severe clinical threat to immunocompromised patients during healthcare construction and demolition due to its aerosolized fungal spores?
What is the primary role of the Certified Health Care Environmental Services Professional (CHESP) on the multidisciplinary ICRA committee prior to the start of a major healthcare renovation project?
Which of the following activities correctly exemplifies an ICRA Construction Activity Type B?