Reference limits for erythema-effective UV doses

Area of Science:

• Dermatology
• Photobiology
• Medical Physics

Background:

• Diagnostic phototesting quantifies UV radiation sensitivity.
• Minimal Erythema Dose (MED) determination is key for assessing photosensitivity.
• Establishing reference limits for MED is essential for clinical interpretation.

Purpose of the Study:

• To estimate reference limits (RLs) of MED in a large sample of white individuals.
• To provide reference data for MED in response to UVA and UVB radiation.
• To support clinicians in differentiating normal from abnormal photosensitivity.

Main Methods:

• Phototesting was performed on 461 white subjects to determine MED for UVB and UVA.
• Skin phototypes were recorded.
• 95% reference intervals were computed using parametric and nonparametric methods.
• MED values were converted to Standard Erythema Doses (SEDs).

Main Results:

• A considerable overlap in MED values was observed across all skin phototypes.
• Age and sex did not substantially influence MED.
• Lower reference limits for MED-UVB were 33 mJ cm⁻² (0.5 SEDs).
• Lower reference limits for MED-UVA were 12.6 mJ cm⁻² (1.2 SEDs).

Conclusions:

• The study provides reference data for MED and SED in white individuals.
• These findings aid in the clinical assessment of UV radiation sensitivity.
• SED results ensure comparability of data across different phototest devices and laboratories.