GuideDiagnostic Laboratory Methods

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

Author

National Cancer Institute (source definition)

Reviewer

Automated source check (NCI definition)

Published

2026-10-18

Updated

2026-10-21

Disclaimer

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)
From radioimmunoassay to mass spectrometry: redefining hypocretin/orexin measurement in narcolepsy. — Sleep, 2026-10-01 (PMID 42436637; literature)

What it is

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.

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