CLT Infection Control & Sterilization in Laser Therapy 2 — Questions and Answers
Question 1: What is the fundamental distinction between sterilization and disinfection?
- They refer to identical decontamination processes
- Sterilization destroys all microbial life including resistant spores; disinfection reduces microorganisms but may not eliminate all spores (Correct answer)
- Disinfection provides a higher level of microbial kill than sterilization
- Sterilization targets bacteria only, while disinfection targets viruses only
Correct answer: Sterilization destroys all microbial life including resistant spores; disinfection reduces microorganisms but may not eliminate all spores
Sterilization achieves a sterility assurance level (SAL) by destroying all viable microorganisms including heat-resistant endospores, which high-level disinfection may not fully eliminate.
Question 2: Which sterilization method is the gold standard for heat-stable laser therapy accessories?
- Prolonged soaking in 70% isopropyl alcohol
- Steam sterilization (autoclave) (Correct answer)
- Ultraviolet (UV) light cabinet exposure
- Dry wiping with a germicidal cloth
Correct answer: Steam sterilization (autoclave)
Autoclaving uses saturated steam under pressure at 121–134°C, reliably achieving sterilization of all heat-stable instruments including bacterial spores.
Question 3: Why can many laser probes with fiber optic delivery systems NOT be autoclaved?
- Autoclaving is cost-prohibitive for routine use
- High heat and steam can permanently damage delicate fiber optic components and coatings (Correct answer)
- Autoclaving alters the emission wavelength of the laser
- The process takes too long relative to patient scheduling needs
Correct answer: High heat and steam can permanently damage delicate fiber optic components and coatings
Fiber optic fibers and their connectors are heat-sensitive; autoclave temperatures and steam pressure can fracture fibers, degrade coatings, and destroy optical alignment.
Question 4: Which Spaulding category requires at minimum high-level disinfection (HLD) before use?
- Non-critical items (contact intact skin only)
- Semi-critical items (contact mucous membranes or non-intact skin) (Correct answer)
- Environmental surfaces with no patient contact
- Administrative items such as patient charts
Correct answer: Semi-critical items (contact mucous membranes or non-intact skin)
Semi-critical items contact mucous membranes or non-intact skin, presenting elevated infection risk that mandates at least high-level disinfection.
Question 5: What does the disinfectant 'contact time' (wet time or dwell time) refer to?
- The time required to apply the disinfectant to the surface
- The duration the surface must remain visibly wet to achieve the product's claimed kill efficacy (Correct answer)
- The shelf life of the disinfectant once opened
- The time needed to rinse residual disinfectant from the surface
Correct answer: The duration the surface must remain visibly wet to achieve the product's claimed kill efficacy
The surface must stay wet for the manufacturer's specified contact time so that the active ingredients maintain sufficient concentration to kill target pathogens.
Question 6: A high-level disinfectant (HLD) is defined as one that kills all of the following EXCEPT:
- Vegetative bacteria
- Mycobacterium tuberculosis
- Lipid and non-lipid viruses
- All concentrations of bacterial spores under all conditions (Correct answer)
Correct answer: All concentrations of bacterial spores under all conditions
HLD destroys all microorganisms including most spores, but sterilization (not HLD) is required to achieve a guaranteed kill of high concentrations of resistant bacterial spores.
Question 7: What is the correct handling policy for items labeled 'single-use' (SUI) in a laser therapy practice?
- Single-use items may be cleaned and reused on the same patient during one visit
- Single-use items must be discarded after each use and must never be reprocessed or reused (Correct answer)
- Single-use items can be resterilized and reused on different patients
- Single-use items can be rinsed and stored for a second use if they appear undamaged
Correct answer: Single-use items must be discarded after each use and must never be reprocessed or reused
Manufacturer SUI designation means the device's sterility, structural integrity, and performance cannot be guaranteed after initial use, making reuse a safety and regulatory violation.
CLT Infection Control & Sterilization in Laser Therapy 2
What is the fundamental distinction between sterilization and disinfection?