Indigenous Patch Iest Unit Resembling Finn Chamber

Abstract

Indigenous patch test unit made front aluminum discs obtained' from the tops of discarded injection vials and adhesive plaster was found suitable after testing:8430 chambers in 471 patients. This patch test unit is cheap and can be easily prepared in a side laboratory. The discs can be resued after washing and drying and disc material has no cross-reactivity with nickel. The large number of -antigens (up to 40) can be tested on the upper back in one sitting The tight occlusion prevents the spread of the reaction beyond the patch test site. Micio-cuts 1-2 in number without subjective discomfort, were produced in iipt6 5% of the chambers and these healed without medication in' 2-3 days. There was no, spill-over of petrolatum based antigens, However, with, aqueous antigens the spill over occurred in up to 2% chambers. The above limitations can be minimized by close scrutiny of the chambers for sharp edges before use and by applying measured quantity of the aqueous antigen.