2.2. Skin prick test (SPT)
Droplets of allergens, histamine (positive control) and a negative
control were applied to the forearms of the subjects. In each droplet, a
small scratch was made into the skin. Skin reactions caused by the
allergens were determined after 15 minutes by a medical doctor. The size
(wheal: length and width) of redness (flare) on the skin around the
allergens and controls was measured. The allergens used in this analysis
are shown in Table 1.