?:definition
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Reagents consisting of substances of known concentrations that are assayed by the usual clinical laboratory methods and that resemble the unknown specimen; they are used for quality control of immunoassay tests performed for the determination of one or more in a group of immunoglobulin E (IgE) proteins or histamines released by mast cells when an antigen (allergen) cross-links two attached IgE molecules. These reagents may be either specific for quality control of an allergy-related substance or, more frequently, appropriate for control of a whole set of similar allergy-related substances.
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