wheal and flare reaction

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• wheal and erythema reaction — wheal and flare reaction the characteristic local cutaneous reaction consisting of an elevated, blanched wheal surrounded by a spreading “flare” of erythema that occurs within a few minutes at the site of a minor nonpenetrating skin injury… …   Medical dictionary

• flare — 1. A gradual tapering or spreading outward. 2. A diffuse redness of the skin extending beyond the local reaction to the application of an irritant; it is due to dilation of the arterioles and capillaries; depends upon an axon reflex set up by the …   Medical dictionary

• reaction — 1. The response of a muscle or other living tissue or organism to a stimulus. 2. The color change effected in litmus and certain other organic pigments by contact with substances such as acids or alkalies; also the property that such substances… …   Medical dictionary

• Prausnitz-KÑŒstner reaction — a type I hypersensitivity reaction produced in a nonatopic subject by intradermal injection of serum from an atopic subject, followed 12 or more hours later by an injection of antigen into the same site; the presence of specific IgE antibody in… …   Medical dictionary

• late phase reaction — an IgE mediated immune reaction occurring 5 to 8 hours after exposure to antigen, after the wheal and flare reactions of immediate hypersensitivity have diminished; it is characterized by inflammation, with accumulation of neutrophils, basophils …   Medical dictionary

• Allergy — Classification and external resources Hives are a common allergic symptom. ICD 10 T78.4 …   Wikipedia

• test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… …   Medical dictionary

• immune system disorder — Introduction        Disorders of the immune systemany of various failures in the body s defense mechanisms against infectious organisms (see table (Disorders of the immune system)). Disorders of immunity include immune deficiency diseases, such… …   Universalium

• WFR — Weil Felix reaction; wheal and flare reaction …   Medical dictionary

• contact urticaria — a type of immune mediated urticaria that is a form of allergic reaction, consisting of a localized or generalized, transient wheal and flare reaction after exposure to the causative substance. See also contact dermatitis …   Medical dictionary

• WFR — • Weil Felix reaction; • wheal and flare reaction …   Dictionary of medical acronyms & abbreviations