While teaching Medical Lasers, I get asked what the difference is between the ANSI 136.3 Standards and the AORN Guidelines. The difference comes down to how they are developed and how they’re used in practice. They complement each other, but they are not the same type of document.
The two terms are related but differ mainly in how decisions or guidelines are formed.
Evidence-Based Practice (EBP) is an approach to decision-making that emphasizes using the best available scientific research, combined with clinical expertise and patient preferences. It’s a structured method: you review high-quality studies (such as randomized controlled trials or systematic reviews), evaluate them, and apply the findings in practice. The goal is to base actions on objective evidence, not just opinion.
Consensus groups are panels of experts who come together to develop recommendations or guidelines when evidence is limited, unclear, or conflicting. They review the available information and then agree on what seems most reasonable. This process relies more on expert judgment than on strong research evidence.
In terms:
- EBP = decisions driven by solid research evidence
- Consensus group = decisions driven by expert agreement
In practice, both are used. Ideally, you should start with evidence-based findings, and when gaps exist, consensus groups help fill in the blanks.
ANSI Z136.3 Consensus Standard
The American National Standards Institute (ANSI) Z136.3 is a formal national standard developed through a consensus process by experts (engineers, physicists, clinicians, and industry professionals).
Key characteristics:
- Scope: Broad laser safety in all healthcare environments (OR, clinics, dental offices, even spas)
- Focus: Hazard control and safety systems
- Content includes:
- Laser classification (Class 1–4)
- Engineering, administrative, and procedural controls
- Laser Safety Officer (LSO) roles
- Eye protection, signage, environmental controls
- Purpose: Establish a framework for a laser safety program and regulatory compliance
- Nature:
- Consensus-based (not research-driven)
- Often referenced by OSHA, regulatory bodies, and accrediting agencies
- Users: All personnel involved with lasers (not just nurses)
Think of ANSI Z136.3 as the “technical rulebook” for laser safety systems.
AORN Guidelines Evidence-based Clinical Practice Guidance
The Association of periOperative Registered Nurses (AORN) publishes evidence-based guidelines specifically for perioperative practice.
Key characteristics:
- Scope: Focused on the operating room and perioperative nursing care
- Focus: Patient care + team practices during laser procedures
- Content includes:
- Fire prevention (e.g., airway fires)
- Skin/eye protection for patient and staff
- Smoke evacuation
- Nursing roles and workflow
- Purpose: Provide best clinical practices based on research + evidence appraisal
- Nature:
- Evidence-based (uses literature reviews, studies, expert consensus grading)
- Updated regularly as new evidence emerges
- Users: Primarily perioperative nurses and surgical teams
Think of AORN as the “how to safely care for the patient during laser surgery” guide.
The core differences
| Feature | ANSI Z136.3 | AORN Guidelines |
| Type | Consensus standard | Evidence-based guideline |
| Focus | Technical laser safety systems | Clinical & perioperative practice |
| Scope | All healthcare laser use settings | Clinical Procedure Areas & Perioperative setting |
| Basis | Expert consensus, physics, engineering controls | Research evidence + clinical outcomes |
| Role | Defines what must be in place (program, controls) | Defines how to apply it in patient care |
| Regulatory use | Often referenced for compliance | Used for best practice and accreditation support |
- ANSI Z136.3 = system-level, technical, consensus safety standard
- AORN = patient-centered, evidence-based clinical practice guideline
ANSI tells you what safety structure you need; AORN tells you how to safely care for the patient within that structure.
This is a classic “fire triad” situation:
- Ignition source: laser
- Fuel: endotracheal tube, drapes
- Oxidizer: oxygen
What ANSI Z136.3 requires (the safety framework)
ANSI doesn’t tell you step-by-step how to run the case, it ensures the system is safe before the case even starts.
Before the procedure, ANSI ensures:
- A Laser Safety Officer (LSO) is designated
- The laser is properly classified (Class 4 for surgical lasers)
- Protective eyewear is available and matched to wavelength
- Warning signage is posted outside the OR
- The room is a controlled laser area
- Staff are trained in laser hazards
- Policies exist for:
- Fire risk
- Equipment checks
- Emergency shutdown
In short, ANSI ensures the environment and the program are safe and compliant.
What AORN tells you to DO during the case
AORN zooms in on clinical actions—what the team actually does, minute by minute.
Fire prevention (this is where AORN gets very specific)
- Use laser-resistant endotracheal tubes
- Fill cuff with saline (often tinted with methylene blue)
- Keep FiO₂ as low as possible (often <30%)
- Avoid nitrous oxide (supports combustion)
- Have sterile water/saline immediately available on the field
Smoke & plume management
- Use a smoke evacuation system with an inline filter
- Position suction within 2 inches of the surgical site
Eye & tissue protection
- Apply moist eye pads for the patient
- Ensure all team members wear correct wavelength-specific eyewear
Team coordination (nursing role emphasized)
- Conduct a laser-specific time-out
- Communicate before laser activation:
- “Laser on”
- “Laser off”
- Verify correct settings and standby mode when not in use
If something goes wrong (fire event)
ANSI perspective:
- Requires that emergency procedures exist
- Staff are trained in fire response protocols
AORN perspective:
Gives the exact steps to take immediately:
- Stop gas flow
- Remove the burning tube
- Pour saline into the airway
- Re-establish ventilation
- Assess injury
ANSI = “You must have a plan” AORN = “Here is the plan, step-by-step”
How they fit together in this case
- ANSI Z136.3
- Ensure the OR is a controlled laser-safe environment
- Requires training, policies, and equipment
- AORN
- Guides the surgical team’s real-time behavior
- Focus on patient safety and clinical outcomes
Simple way to remember it
In this airway laser case:
- ANSI:
“Is the room, equipment, and program safe and compliant?” - AORN:
“Is the patient protected from fire, injury, and complications right now?”
