1. A laboratory technique in which antigens and antibodies diffuse through a gel medium and form visible precipitate lines where they meet, used to identify and analyze proteins.
Usage: technical; immunology; also called gel diffusion or agar diffusion

Examples

• The immunodiffusion test revealed the presence of specific antibodies in the patient's serum.
• Researchers used immunodiffusion to confirm the identity of the unknown protein sample.
• In the immunodiffusion assay, wells were cut into the agar plate and filled with antigen and antibody solutions.
• The immunodiffusion technique is valuable for detecting food allergens in laboratory settings.
• Double immunodiffusion is commonly used to study antigen-antibody interactions in clinical diagnostics.