It was quite an interesting test/experience. The tech had a box of 80 oils; each one containing one form of allergen. She dipped panels of "needles" (10 needles per panel, 8 panels) into the oils and placed them on my back. This isn't the same panel she used, but you get the gist.
It took her about 10 minutes to place the 8 panels on my back, and then I had to wait about 20 minutes for them to do their thing. The first one started to do its thing almost immediately as she saw a reaction starting right after placing the first set of needles. There was nothing painful about the test however it was a long time to lie there without moving (and tipping the needle panels over), especially after the reactions started and things got slightly itchy. She came back in twice to check on me and then again to read the results.
The little dots that are just dots show where the allergen was placed, but do not show a reaction. For example, the very last panel (bottom left in this picture) shows little to no reaction. Anywhere that has a blotch or red that goes beyond that little dot shows a reaction. The tech noted each one and the level of reaction.
The reactions are rated from 7-13, with 7 being a reaction but the lowest and 13 being the highest. The results showed that I am allergic to 49 out of the 80 allergens tested. No foods, some animals (including some reaction to dogs), but the reactions I had most were to trees and grasses. So while I'm thrilled I don't have to stop eating cheese (I was worried about dairy being a culprit) or give my dog away, the bad news is I have no control over environmental allergens as they are everywhere.