patch test
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patch
[pach]a small area differing from the rest of a surface.
Peyer's p's whitish, oval, elevated patches of closely packed lymph follicles in mucous and submucous layers of the small intestine.
salmon patch a salmon-colored nevus flammeus usually found over the eyelids, between the eyes, or on the forehead. It is the most common vascular lesion of infancy, found in 40 per cent of newborns, and usually fades in the first year of life. Called also nevus simplex.
patch test a type of skin test for hypersensitivity in which filter paper or gauze saturated with the substance in question is applied to the skin, usually on the forearm; a positive reaction is reddening or swelling at the site.
Patch test.
patch test
a test of skin sensitiveness: a small piece of paper, tape, or a cup, wet with nonirritating diluted test fluid, is applied to skin of the upper back or upper outer arm and after 48 hours the covered is compared with the uncovered surface; an erythematous reaction with vesicles occurs if the substance causes contact allergy.
See also: photo-patch test.
See also: photo-patch test.
patch test
n.
A test for allergic sensitivity in which a suspected allergen is applied to the skin on a small surgical pad.
patch test
Allergy skin test, contact dermatitis skin test, patch skin test Immunology An epicutaneous test of contact-type–delayed hypersensitivity, which consists of applying a patch with a low dose of an allergen–antigen to an unexposed area of the skin, usually the back, and observing the site 1-2 days later; the most common sensitizing haptens in North America are poison ivy–Toxicodendron radicans, nickel, chromate, paraphenylenediamine–a dye constituent, ethylenediamine–a solvent and emulsifier, local anesthetics–eg, benzocaine, rubber, neomycin, and others; PT materials have been standardized and are available commercially, either as individual allergens, or as batteries of allergens, including those for specific occupations–eg, hairdressers, printers, and others; incorrect PT results are common in the form of false-positives, due to too high concentration of allergens in the patches, misinterpretation of irritant reactions, and generalized erythema of the skin testing site; false-negative results are linked to technical errors and failure to simulate the 'real-world' situation in which the person is exposed to the allergenpatch test
(pach test)A test of skin sensitiveness: a small piece of paper, tape, or a cup, wet with a dilute solution or suspension of test material, is applied to skin of the upper back or upper outer arm, and after 48 hours the area previously covered is compared with the uncovered surface; an erythematous reaction with vesicles occurs if the substance causes contact allergy.
See also: photo-patch test
See also: photo-patch test
patch test
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APPLYING PATCH TEST
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APPLYING PATCH TEST
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APPLYING PATCH TEST
A skin test in which a low concentration of a presumed allergen is applied to the skin beneath an occlusive dressing. The test is the primary method used to determine the presence of allergic contact dermatitis. If the concentration of the agent is too high or an allergy exists to the material used in the dressing, false-positive reactions can occur as a result of local irritation. False-negative reactions may result if the concentration of the suspected allergen is too low, or if the duration of the test is too short. Commercially available, standardized kits to facilitate patch testing include the T.R.U.E. test and Finn Chambers. See: illustration; skin test
illustrationPatch test
A skin test that is done to identify allergens. A suspected substance is applied to the skin. After 24-48 hours, if the area is red and swollen, the test is positive for that substance. If no reaction occurs, another substance is applied. This is continued until the patient experiences an allergic reaction where the irritant was applied to the skin.
Mentioned in: Dermatitis, Skin Lesions
patch test
(pach test)A test of skin sensitivity; a small piece of paper, tape, or a cup, wet with a dilute solution or suspension of test material, is applied to skin of the upper back or upper outer arm, and after 48 hours the area previously covered is compared with the uncovered surface; an erythematous reaction with vesicles occurs if the substance causes contact allergy.