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Immunoassays Detecting Antigen-Antibody Aggregates definitions

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  • Agglutination
    Clumping of large insoluble particles due to antibodies cross-linking antigens, forming visible aggregates in solution.
  • Precipitation
    Formation of insoluble lattices when antibodies cross-link small soluble antigens, resulting in visible precipitates.
  • Antigen
    Molecule capable of binding to antibodies, often found on cells or pathogens, and triggers immune detection.
  • Antibody
    Y-shaped protein produced by the immune system that specifically binds to antigens, facilitating their detection.
  • Direct Agglutination
    Reaction using native antigens, typically on whole cells, to detect clumping directly with specific antibodies.
  • Indirect Agglutination
    Test where antibodies or antigens are attached to latex beads, enabling detection of target molecules in samples.
  • Hemagglutination
    Type of direct agglutination used for blood typing by detecting antigens on red blood cells via visible clumping.
  • Latex Beads
    Artificial particles used as carriers for antibodies or antigens in indirect agglutination assays to enhance visibility.
  • Precipitant Line
    Visible line formed in a gel where optimal antigen-antibody ratios create insoluble precipitates, confirming specific binding.
  • Double Immunodiffusion
    Gel-based assay where antigen and antibody diffuse toward each other, forming a precipitant line at the zone of equivalence.
  • Zone of Equivalence
    Region where antigen and antibody concentrations are optimal for maximal precipitate formation in immunodiffusion tests.
  • Zone of Antibody Excess
    Area in immunodiffusion where surplus antibodies prevent precipitate formation due to unbalanced ratios.
  • Zone of Antigen Excess
    Area in immunodiffusion where surplus antigens inhibit precipitate formation by overwhelming available antibodies.
  • Adaptive Immunity
    Immune response involving specific recognition and memory of antigens, assessed by immunodiagnostic assays.
  • Immunodiagnostics
    Field utilizing antigen-antibody interactions to detect or quantify immune components for disease diagnosis.