<unk>  is a diagnostic test which involves diffusion through a substance such as agar which is generally soft gel agar (2%) or agarose (2%), used for the detection of antibodies or antigen. The commonly known types are: :# Single diffusion in one dimension (Oudin procedure) :# Double diffusion in one dimension (Oakley Fulthorpe procedure) :# Single diffusion in two dimension (radial<unk>  or Mancini method) :#Double diffusion in two dimensions (Ouchterlony double<unk>
Immunodiffusion
Counterimmunoelectrophoresis
Radial immunodiffusion
Immunoelectrophoresis
Direct fluorescent antibody
Direct agglutination test
Mixed-field agglutination
Immunoassay