Skin prick test

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A test of IgE-related allergy involving pricking through the suspect allergen into the epidermis of the skin and observing for an immediate hypersensitivity response. This includes: itching, erythema, weal and flare response. It is a diagnostic tool but it is essential to have resuscitation facilities and adrenaline to hand in case of a serious anaphylactic reaction.

Avoid in patients with the following:

- On anti-histamines (false negative result) - Previous history of anaphylaxis (more dangerous) - Extensive skin disease (practical problem) - Presence of dermatographism (false positive result) - Very young, pregnant women (relative)