(under subclass 9.8) Subject matter wherein the agent, an antigenic substance or allergen, is applied to or injected into a subject in order to determine whether the subject is allergic or hypersensitive to the agent as indicated by a visible change on the skin (i.e., redness, swelling, etc.).
(1) Note. The antigenic substance or allergen includes pollen, house dust, micro-organisms, chemicals, etc.
(2) Note. Skin tests such as those to indicate an individual's sensitivity to penicillin or other medicaments, tuberculosis tests, etc. are included in this subclass.