The procedure for an SPT is relatively simple. A healthcare provider places drops of different allergens on the patient’s skin. Each drop is then pricked with a sterile lancet to introduce the allergen into the dermis. After about 15-20 minutes, the test site is observed for reactions, which are measured in terms of the size of the wheal (raised bump) and flare (redness). A positive reaction indicates that the patient is sensitized to that particular allergen.
