CLT Study Guide 2026
Everything you need to pass the CLT exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CLT Exam Format at a Glance
📚 CLT Topics to Study (69)
✍️ Sample CLT Questions & Answers
1. What is the primary difference between Class 3B and Class 4 therapeutic lasers in PBM?
Class 4 lasers exceed 500 mW output, enabling faster treatment and deeper penetration but also carrying greater risk of thermal injury compared to Class 3B.
2. What is the primary goal of laser therapy?
The primary goal of laser therapy, particularly low-level laser therapy (LLLT) or photobiomodulation, is to enhance healing and reduce pain. It achieves this by stimulating cellular function, reducing inflammation, improving circulation, and promoting tissue regeneration. This non-invasive approach helps accelerate recovery from various injuries and conditions.
3. Retrograde axonal transport of photobiomodulation signals primarily affects which system?
PBM light absorbed by peripheral nerve endings can trigger retrograde signals along axons to cell bodies, affecting neurological function.
4. What should a CLT document if a patient reports an adverse reaction following laser therapy?
Adverse event documentation must include a full description of the reaction, its severity, onset time, interventions performed, and the follow-up care plan.
5. A laser therapist asks the LSO whether laser-generated air contaminants (LGAC) from tissue ablation pose a safety risk. What is the LSO's responsibility?
The LSO must assess laser-generated air contaminant risks and ensure that appropriate ventilation, filtration, and respiratory protection controls are implemented.
6. Cytochrome c oxidase (CCO) absorbs light most efficiently in which spectral bands?
CCO has absorption peaks in the red (~620–680 nm) and near-infrared (~760–830 nm) spectral regions, which correspond to the primary therapeutic wavelengths used in PBM.