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Table 1 Drug Patch Testing

From: Patch Testing in Non-Immediate Drug Eruptions

Characteristics

ESCD[6]

ENDA[7]

Time interval*

6 wk-6 mo

3 wk-3 mo

Site

Upper back

Upper back

Reading

20 min, D2, (D3), D4, D7

D2, D3, (D4)

Scoring

ICDRG criteria

EECDRG criteria

  1. D = day; EECDRG = European Environmental Contact Dermatitis Research Group; ENDA = European Network on Drug Allergy; ESCD = European Society of Contact Dermatitis; ICDRG = International Contact Dermatitis Research Group.
  2. *Time interval between the complete healing of cutaneous adverse reactions and the allergologic evaluation.
  3. 0 = no reaction; ? = doubtful reaction; + = weak (non-vesicular) reaction; ++ = strong (edematous or vesicular) reaction; +++ = extreme reaction.
  4. 0 = no reaction; ? = faint erythema; + = erythema, infiltration, possibly discrete papules; ++ = erythema, infiltration, papules, vesicles; ++++ = intense erythema, infiltration, coalescing vesicles.