Skin sensitization test data are required or considered by chemical regulation authorities around the world. These data are used to
develop product hazard labeling for the protection of consumers or workers and to assess risks for exposure to skin-sensitizing chemicals.
To identify opportunities for regulatory uses of non-animal replacements for skin sensitization tests, the needs and uses for skin sensitization test data must first be clarified. Thus, we reviewed skin sensitization testing requirements for seven countries or regions that are represented in the International Cooperation on Alternative Test Methods (ICATM). We noted the type of skin sensitization data required for each chemical sector and whether these data were used in a hazard classification, potency classification, or risk assessment context; the preferred tests; and whether alternative non-animal tests were acceptable. An understanding of national and regional regulatory requirements for skin sensitization testing will inform the development of ICATM's international strategy for the acceptance and implementation of nonanimal alternatives to assess the health hazards associated with potential skin sensitizers.