scratch test

American  

noun

1. a test for a suspected allergy in which the skin is scratched and an allergen applied to the area, redness indicating a positive reaction.

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scratch test British  

noun

1. med a skin test to determine allergic sensitivity to various substances by placing the allergen to be tested over an area of lightly scratched skin. A positive reaction is typically indicated by the formation of a weal

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Etymology

Origin of scratch test

First recorded in 1935–40

Example Sentences

For pieces of unknown purity, she performed a quick scratch test using an acid kit to help determine the metal’s karat composition.

From Los Angeles Times

An iodine-based scratch test or spectral analysis of leaves could indicate the presence of little cherry disease before it is exhibited in the fruit, Galimba said.

From Seattle Times

Wahlberg, 49, captioned the photo following an allergy scratch test while donning a mask at a doctor's office.

From Fox News

Dejneka nods, saying he had the same experience with that sample, and eagerly points to the exact spot on the counter where he did his scratch test last year.

From Forbes