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The CLP exam has 100 questions and runs 2 hours.
These 10 free CLP questions are organized by exam domain, so you can see how each part of the Certified Laser Professional blueprint is tested. Reveal the answer and explanation under each question.
An operator will use both 755 nm and 1,064 nm during one visit and needs one pair of protective glasses. The laser safety assessment requires at least optical density (OD) 5 at each wavelength. All four pairs fit properly, are undamaged, and are suitable for the pulse characteristics in use. Select the label that meets both the wavelength and attenuation requirements.
Correct answer: D - OD 6 across 700-1,100 nm
Immediately after a 1,064-nm hair-removal pulse, a client reports a new dark spot in central vision that does not clear with blinking. A gap is discovered beneath one eye protector. The eye is not painful, and no external injury is visible. Emission has been stopped and the laser made safe. What takes priority now?
Correct answer: A - Arrange urgent ophthalmic assessment for possible laser injury.
A client has fair, untanned skin and reports a lifelong tendency to burn easily with unprotected sun exposure. Even after repeated exposure, she develops only a faint tan. She takes no photosensitizing medication. Which Fitzpatrick phototype best matches her usual burn-and-tan response?
Correct answer: B - Type II
One photo-rejuvenation device is described as fractional ablative; another is fractional nonablative. What does the word "fractional" tell you about both treatments?
Correct answer: C - Microscopic treatment zones are separated by untreated tissue.
An adult with Fitzpatrick type V skin seeks reduction of coarse black neck hair. There is no recent tan, active skin disease, or other contraindication. The clinic has long-pulsed 755-nm alexandrite and 1,064-nm Nd:YAG systems, appropriate cooling, and a practitioner trained in both. Which plan most appropriately accounts for epidermal melanin?
Correct answer: C - Use Nd:YAG; its lower epidermal melanin absorption reduces competing heating.
During lower-leg laser hair removal, the treated follicles develop small rings of redness and mild swelling. Discomfort settles with the prescribed cooling, and the skin between follicles remains normal. The same parameters produced a satisfactory test-spot response at an earlier visit, and the skin assessment is unchanged. How should the operator proceed?
Correct answer: B - Continue at the assessed settings while observing the tissue response.
At review 24 hours after IPL treatment of dermatologist-confirmed solar lentigines, the treated spots are darker and have a fine, dry, speckled appearance. Surrounding skin is unchanged, and there is no worsening pain, blistering, or drainage. What should the client be advised to do?
Correct answer: B - Continue gentle aftercare and photoprotection; allow the darkened spots to shed naturally.
An absorbing target has an estimated thermal relaxation time of 20 ms. Two pulses would deposit the same energy in that target, one over 5 ms and the other over 100 ms; wavelength and spot size are unchanged. Under the thermal-confinement principle, which comparison is sound?
Correct answer: D - The 5-ms pulse confines heat better because less heat diffuses away during energy delivery.
A client with dense black axillary hair asks whether several extra laser passes today could replace later appointments. What feature of follicular biology explains the value of spacing treatments over time?
Correct answer: C - Different follicles enter the responsive, pigment-producing anagen phase at different times.
During a bench output comparison, a 10-mm-diameter circular spot delivers 20 J/cm². The spot diameter is changed to 20 mm while the energy per pulse remains fixed. Both beams have uniform profiles. What fluence should be recorded, and has the original fluence been preserved?
Correct answer: A - 5 J/cm²; keeping pulse energy constant does not preserve fluence.
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