patch test

patch test
Med. a test for suspected allergy by application to the skin of a patch impregnated with an allergen: allergic reaction is indicated by redness at the site of application.
[1930-35]

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Controlled application of biological or chemical substances to the skin to test for allergy.

Small amounts of diluted test substances applied under a patch of cloth or soft paper and an impermeable membrane are left in place for 48 hours, and the skin reaction is then examined and scored from 0 (none) to 4+ (severe blistering and redness).

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      controlled application of biological or chemical substances to the skin in order to detect if the subject has an allergic hypersensitivity (allergy) to one of them. The test was originally developed to test new chemical compounds for their allergic potential on animals but has since become widely used to diagnose allergies in humans. Patch testing is usually done on the skin of the upper back or the outer arm. Small amounts of test substances diluted in a solvent such as water or petroleum jelly are applied to the skin under a patch of cloth or soft paper and an impermeable membrane. The patch is left in place for 48 hours, after which the skin reaction is examined and scored from 0 (no apparent reaction) to 4+, indicating severe blistering as well as angry redness of the exposed skin. Patch testing is an extremely accurate indicator of allergic sensitivity.

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Universalium. 2010.

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