National Cancer Institute (source definition)
Radioimmunoassay
Radioimmunoassay (RIA) is an immunological technique, which quantitatively determines antigen and antibody concentrations, using a radioactively labeled substance (radioligand), either directly or indirectly.
Review and references
Automated source check (NCI definition)
2026-10-18
2026-10-19
professional use
References
- NCI Thesaurus 26.09d — Radioimmunoassay (C17057)
- Source: National Cancer Institute, NCI Thesaurus 26.09d, C17057. NCI definition, reproduced without modification under CC BY 4.0.
- Analytical evaluation and method comparison of an orexin-A radioimmunoassay in cerebrospinal fluid: establishing a cut-off value for type 1 narcolepsy and exploring genetic and clinical characteristics. — Sleep Med, 2026-09-15 (PMID 42753384; literature)
What it is
Radioimmunoassay (RIA) is an immunological technique, which quantitatively determines antigen and antibody concentrations, using a radioactively labeled substance (radioligand), either directly or indirectly.
Source: National Cancer Institute, NCI Thesaurus 26.09d, C17057. 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.