patch test


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patch test

[′pach ‚test]
(immunology)
A test in which material is applied and left in contact with intact skin surfaces for 48 hours in order to demonstrate tissue sensitivity.
References in periodicals archive ?
The implementation of targeted epicutaneous tests (patch tests) using relevant haptens [3] enables a more accurate diagnostic evaluation.
Patch test reactions were recorded according to the International Contact Dermatitis Research Group (ICDRG) criteria: - negative;?+ doubtful reaction, faint erythema only; + weak positive reaction; palpable erythema, infiltration, possibly papules; ++ strong positive reaction; erythema, infiltration, papules, vesicles; +++ extreme positive reaction; intense erythema and infiltration and coalescing vesicles; IR irritant reaction of different types; and NT not tested.
Patch tests on intact back skin with the cream and its components showed delayed-type reactions to the cream (as is) and to TCD 1% aq.
North American contact dermatitis group patch test results: 2011-2012.
Contact allergy to (meth)acrylates in the dental series in southern Sweden: Simultaneous positive patch test reactions patterns and possible screening allergens.
The diagnosis of OACD was established in cases meeting the following criteria [14-16]: (A) confirmed as a case of occupation-related CD; (B) exposure to the relevant occupational allergens; (C) confirmed positive patch test reaction to the relevant occupational allergens; and (D) exposure confirmed as a cause or as an important aggravating factor in the development of the skin diseases.
* If topical steroids are being used on the back, patch test should be delayed for 3 days.
It is therefore advisable to always do a patch test first, before you use the dye.
'Look at the ingredients, and if you're not sure do a patch test on your arm to check it won't cause a reaction.' ?
Our 29 (43.2%) patients with melasma showed positive patch test results from cosmetic chemicals.
The texture depth of the surface on which the sand patch test is performed, is represented by mean texture depth (MTD).