A series of superficial pin pricks on the arms or back introduces allergens to the patient. This is a quick, convenient, and inexpensive option for diagnosing allergies. After 15-20 minutes, if a raised, itchy bump is present at a prick site, the patient is allergic to that allergen. 

Prick Puncture Skin Test (PPST)

Allergens are introduced via an injection of a tuberculin needle into the dermis. The presence of a raised, itchy bump after 15-20 minutes indicates the patient is allergic to the allergen.

Intradermal Test

There are two common procedures used to diagnose Type I Hypersensitivities: 
- Prick Puncture Skin Test (PPST)
- Intradermal Test

Both of these procedures look for  the formation of a raised, itchy bump 15-20 minutes (a wheal-flare reaction). The larger the reaction, the greater the sensitivity to the allergen.

Austin Community College

Type 1 Hypersensitivities occur when an IgE antibody reacts with an allergen and triggers mast  cell degranulation. Allergens can range from harmless substances such as pollen to hazardous substances such as insect venom or even food intolerances. 

Type 1 Hypersensitivity

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