Agglutination is the interaction s between insoluble particles (e.g. intact bacteria
and cells) or soluble antigens that attached to particles and their corresponding
specific antibodies that result in some visible agglutinates if given enough time
and the proper concentration of electrolyte.
Tube agglutination test is usually used in the semi-quantitative test , by mixing the
known particle antigen directly with serial dilution s of diagnostic serum in the
tubes. Observe the appearance of agglutinates in the tubes after certain time.
Determine the level of the antibody in the serum and its titer according to the
relative agglutinationamount.