group agglutination


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agglutination

 [ah-gloo″tĭ-na´shun]
1. the action of an agglutinant substance.
2. the clumping together in suspension of antigen-bearing cells, microorganisms, or particles in the presence of specific antibodies (agglutinins).
Agglutination reactions. From Applegate, 2000.
3. the process of union of the surfaces of a wound. adj., adj agglutina´tive.
cross agglutination the agglutination of particulate antigen by an antibody raised against a different but related antigen; see also group agglutination.
group agglutination agglutination, usually to a lower titer, of various members of a group of biologically related organisms by an agglutinin specific for one of that group. For instance, the specific agglutinin of typhoid bacilli may agglutinate other members of the colon-typhoid group, such as Escherichia coli and Salmonella enteritidis.
intravascular agglutination clumping of particulate elements within the blood vessels; used conventionally to denote red blood cell agglutination.
platelet agglutination the clumping together of platelets owing to the action of platelet agglutinins; such agglutinins are important in platelet typing.
agglutination test any test based on an agglutination reaction, as serologic tests for specific antibodies.

group ag·glu·ti·na·tion

agglutination by antibodies specific for minor (group) antigens common to several microorganisms, each of which possesses its own major specific antigen.
Synonym(s): cross agglutination

group ag·glu·ti·na·tion

(grūp ă-glū'ti-nā'shŭn)
Agglutination by antibodies specific for minor (group) antigens common to several microorganisms, each of which possesses its own major specific antigen.

agglutination

aggregation of separate particles into clumps or masses; especially the clumping of bacteria or blood cells by antibody specific to, or directed against, surface antigenic determinants. See also agglutinin.

bacterial agglutination test
a diagnostic procedure that employs serum or other body fluid of unknown antibody titer, titrated with standard suspension of bacteria as antigen. These may be performed quantitatively in 96-well microtitration plates or qualitatively on slides.
cross agglutination
the agglutination of particulate antigen by an antibody raised against a different but related antigen; see also group agglutination (below).
group agglutination
agglutination—usually to a lower titer—of various members of a group of biologically related organisms by an agglutinating antibody made to one of that group.
intravascular agglutination
clumping of particulate elements within the blood vessels; used conventionally to denote red blood cell agglutination.
latex agglutination test
see passive agglutination test (below).
microscopic agglutination test
one in which the test mixtures are examined microscopically to detect the agglutination.
mucus agglutination test
see mucus agglutination test.
passive agglutination test
an agglutination reaction in which a soluble antigen, such as gonadotropin, is linked to inert particles such as latex beads or tanned erythrocytes.
platelet agglutination
the clumping together of platelets owing to the action of platelet agglutinins. Such agglutinins are important in platelet typing.
slide agglutination test
a rapid screening or semiquantitative test in which antibody and antigen are mixed on a glass slide and observed for agglutination.
agglutination test
see bacterial agglutination test (above).
tube agglutination test
an agglutination test for the identification of bacteria carried out in a test tube, a positive reaction consisting of a clearing of a prior opalescence.