Radioimmunoprecipitation Assay
Also written as: RIPA — Radioimmunoprecipitation Assay
A legacy laboratory method using radioactive tracers to measure hormone concentrations, now largely replaced by safer alternatives.
Full Definition
Radioimmunoprecipitation assay (RIPA) was once the gold standard for hormone testing, utilizing radioactive isotopes as tracers to detect and quantify hormones through competitive binding assays. The method involves mixing patient samples with known amounts of radioactively labeled hormones and specific antibodies, then measuring the radioactivity to determine hormone concentrations. While RIPA provided excellent sensitivity and specificity, it has been largely phased out in favor of non-radioactive methods due to safety concerns, disposal requirements, and regulatory restrictions. Understanding RIPA remains important for interpreting historical data and validation studies.
Usage
Usage note: Historical context is important when editing comparative studies or validation papers.
In Context
- "Historical studies using radioimmunoprecipitation assay provide valuable baseline data despite methodological differences." — Research methodology discussion
- "The laboratory discontinued RIPA in favor of chemiluminescent methods to eliminate radioactive waste concerns." — Laboratory transition documentation