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gel dif·fu·sion pre·cip·i·tin tests in one di·men·sion
precipitin tests in which antigen solution and antibody incorporated in agar are layered in tubes, permitting effective diffusion in the vertical dimension; the antibody-containing agar may be overlaid directly with antigen solution (single [gel] diffusion in one dimension).
radial immunodiffusionAbbreviation: RID
A means of measuring the amount of antigen in a sample in which a solution containing the antigen is dropped into a gel evenly impregnated with antibody. The diameter of the ring that precipitates around the solution varies directly with the amount of antigen in the solution.
See also: immunodiffusion