patch test

English - English

Definition of patch test in English English dictionary: A test for allergic sensitivity in which a suspected allergen is applied to the skin on a small surgical pad. 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); A method by which a specified volume of fluid is filtered through a membrane filter of known pore structure All particulate matter in excess of an "average size," determined by the membrane characteristics, is retained on its surface Thus, the membrane is discolored by an amount proportional to the particulate level of the fluid sample Visually comparing the test filter with standard patches of known contamination levels determines acceptability for a given fluid; a test to determine allergic sensitivity by applying small pads soaked with allergen to the unbroken skin; another name for skin test; a test in which a patch of elements is subjected to a set of nodal point displacements that in an exact analysis correspond to the constant strain condition If the element strains calculated by FEA do actually represent the constant strain condition, the patch test is passed