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An immunoassay for plasma cortisol based on chemiluminescence
Steroids
|October 1, 1980
Summary
A new chemiluminescence immunoassay accurately measures cortisol in human plasma. This method avoids radioactivity and simplifies sample processing, offering an alternative to radioimmunoassay for clinical diagnostics.
Area of Science:
- Clinical Chemistry
- Biochemistry
- Immunology
Background:
- Accurate cortisol measurement is crucial for diagnosing adrenal disorders.
- Existing methods like radioimmunoassay (RIA) involve radioactivity and complex separation steps.
Purpose of the Study:
- To develop and validate a novel chemiluminescence immunoassay (CLIA) for quantifying cortisol in human plasma.
- To compare the performance of the CLIA with established radioimmunoassay (RIA) methods.
Main Methods:
- Utilized a cortisol-isoluminol conjugate as a chemiluminescent marker.
- Employed a competitive protein binding assay format with delayed light emission.
- Validated the assay using plasma extracts from normal and pathological samples.
Main Results:
- Demonstrated a dose-dependent inhibition of light emission by cortisol (linear range: 20-1000 pg/tube).
- Achieved high correlation (r=0.98) with radioimmunoassay results for plasma cortisol levels.
- Showcased comparable sensitivity, specificity, precision, and accuracy to RIA.
Conclusions:
- The developed chemiluminescence immunoassay provides a sensitive, specific, and accurate method for plasma cortisol determination.
- This CLIA obviates the need for radioactivity counting and ligand separation, simplifying the assay procedure.
- The assay is a viable alternative to RIA for routine clinical use in assessing cortisol levels.