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==Introduction==
Immunodiffusion reactions are diagnostic tests that use the diffusion of particles through a medium (such as agar) to measure:
Immunodiffusion reactions are diagnostic tests that use the diffusion of particles through a medium (such as agar) to measure:
*Relative concentrations of antibodies/antigens
*Relative concentrations of antibodies/antigens
*'''Double immunodiffusion''': also known as the Ouchterlony method. Antigen and antibody preparations are placed on the medium and both allowed to diffuse radially from the wells towards each other. This establishes a concentration gradient, forming an area of equivalence and line of precipitin.
*'''Double immunodiffusion''': also known as the Ouchterlony method. Antigen and antibody preparations are placed on the medium and both allowed to diffuse radially from the wells towards each other. This establishes a concentration gradient, forming an area of equivalence and line of precipitin.
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{{Jim Bee 2007}}
[[Category:Immunological Testing]]
[[Category:Immunological Testing]]