16th October 2019


What is a positive control in an allergy test?

A positive histamine skin test means that any skin tests performed at that same time with a negative result are in fact, truly negative (and that the negative result was not just due to the person taking an antihistamine, for example). The negative control is usually a salt water, or saline, substance.

Furthermore, what is a wheal and flare?

wheal-and-flare reaction. n. The characteristic immediate reaction to an injected allergen in a skin test, in which an irregular blanched wheal appears, surrounded by an area of redness.

What is a percutaneous test?

Prick or scratch test: In this test, a tiny drop of a possible allergen—something you are allergic to— is pricked or scratched into the skin. (This is also called a percutaneous test.) It is the most common type of skin test. A small amount of the possible allergen is injected under the skin through a thin needle.
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