What steps should be included in a test patch procedure before full treatment?

• A. Select a small area, document device settings, apply, observe for adverse reactions over 24–72 hours, and obtain informed consent.
• B. Apply to the entire treatment area, document settings, observe for 1 hour, and proceed without consent.
• C. Skip patch testing and proceed directly to full treatment.
• D. Only review the patient's medical history; do not perform a patch.

Answer: (A)

Before full laser treatment, a test patch is used to verify that the chosen parameters won’t cause an adverse skin reaction. The best approach is to select a small, representative area, document the exact device settings, apply the laser to that patch, observe for adverse reactions over a period (typically 24–72 hours), and obtain informed consent before proceeding. This sequence protects the patient from burns or pigment changes and gives you concrete feedback to adjust settings if needed. The other options fall short because treating the entire area without a preliminary test misses early signs of intolerance, monitoring only for a short period doesn’t catch delayed reactions, skipping patch testing eliminates a crucial safety check, and relying only on medical history ignores how the skin might actually respond to the treatment.