National Cancer Institute (source definition)
Radial Immunodiffusion
A quantitative technique used to detect and estimate the concentration of an antigen by measuring the diameter of the ring of precipitation (precipitin ring), which is formed as a result of the interaction of the antigen and an antibody at optimal concentration.
Review and references
Automated source check (NCI definition)
2026-10-19
2026-10-19
professional use
References
- NCI Thesaurus 26.09d — Radial Immunodiffusion (C119296)
- Source: National Cancer Institute, NCI Thesaurus 26.09d, C119296. NCI definition, reproduced without modification under CC BY 4.0.
- Evaluation of a lateral flow immunoassay for the quantitative measurement of immunoglobulin G in foals compared with radial immunodiffusion. — J Vet Intern Med, 2026-09-01 (PMID 42765740; literature)
- Single Radial Immunodiffusion (SRID) Assay for Quantitative Determination of Recombinant SOD Protein in a Brucellosis Vaccine Candidate: Method Development and Validation. — Methods Protoc, 2026-07-28 (PMID 42646508; literature)
What it is
A quantitative technique used to detect and estimate the concentration of an antigen by measuring the diameter of the ring of precipitation (precipitin ring), which is formed as a result of the interaction of the antigen and an antibody at optimal concentration.
Source: National Cancer Institute, NCI Thesaurus 26.09d, C119296. NCI definition, reproduced without modification under CC BY 4.0.
Source identity and definition checked automatically on 2026-10-18. No individual clinical interpretation or human reviewer is asserted.
Compliance note
Reference intervals and interpretation depend on the laboratory, specimen, method and clinical context. This source definition is educational information; it does not establish a diagnosis, product approval or suitability for an individual.