Metal Allergy Testing - "Assessment of Metal Allergy: Patch Testing"

Table 1 Mark patch test results according to ICDRG

Table 1 gives the interpretation of the symbols. The irritant response depicted on the right side of the composite image is a "common irritant response" manifesting as a homogeneous erythema without infiltration (top) and a "erythema response" with punctate erythema (bottom).

 Figure 1 Patch test response spectrum

Table 2 Practical CODEX systems for determining the association of positive allergic reactions

Table 3 Summary of commercial metal patch test formulations as of 2016

Figure 2 The irritant response of pustular type to zinc chloride 2% pet

Immediately after patch removal (2 days after occlusion). The same testing site 1 day later. Note the distinct "recession" pattern, indicating that the healing process begins immediately after removal of the irritant.