[How to test occupational products brought in by patients]. / Comment tester les produits professionnels apportés par les patients.

Where allergic investigations are carried out for occupational dermatitis, appropriate tests must be performed but commercially available batteries are not always suitable for the working conditions and for the products handled by patients. During testing, the products being handled must thus be correctly diluted with full knowledge of their composition in order to prevent harmful effects, particularly caustic effects, and to avoid false positives and false negatives.