Immunodiffusion is a diagnostic test which involves diffusion through a substance such as

agar Agar ( or ), or agar-agar, is a jelly-like substance consisting of polysaccharides obtained from the cell walls of some species of red algae, primarily from ogonori (''Gracilaria'') and "tengusa" (''Gelidiaceae''). As found in nature, agar i ...

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 immunodiffusion Radial immunodiffusion (RID) or Mancini method, Mancini immunodiffusion or single radial immunodiffusion assay, is an immunodiffusion technique used in immunology to determine the quantity or concentration of an antigen in a sample. Description ...

or Mancini method) :#Double diffusion in two dimensions (

Ouchterlony double immunodiffusion Ouchterlony double immunodiffusion (also known as passive double immunodiffusion) is an immunological technique used in the detection, identification and quantification of antibodies and antigens, such as immunoglobulins and extractable nuc ...

) Photographs of Ouchterlony immunodiffusion patterns showing stained precipitin lines of full identity, partial identity and non-identity.

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* Biological techniques and tools Diagnostic virology Immunologic tests {{immunology-stub