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Practical aspects of Ab assays Each Ab assay has its own characteristic advantages and disadvantages based on technical difficulty, intra- and interassay variability (i.e., precision), sensitivity for measuring Abs, specificity for the target protein or ligand, susceptibility to false-positive or false-negative results, and cost.
Bridging Enzyme-Linked Immunosorbent Assay (ELISA) is commonly used in detection of antibodies directed against therapeutic proteins. Advantages of the bridging ELISA include the capability to detect antibodies regardless of their isotype or the species of origin. However, detection of antibodies can be difficult, if not impossible, in the presence of high levels of the antigen in the sample matrix.