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Related Experiment Videos

A direct microassay for aldosterone in plasma extracts.

J Sancho, E Haber

    The Journal of Clinical Endocrinology and Metabolism
    |August 1, 1978
    PubMed
    Summary

    This study developed a highly sensitive radioimmunoassay (RIA) for aldosterone, enabling direct measurement in small plasma samples. The enhanced assay offers improved accuracy and efficiency for clinical diagnostics.

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    Area of Science:

    • Endocrinology
    • Immunology
    • Analytical Chemistry

    Background:

    • Radioimmunoassay (RIA) for aldosterone previously established using specific antibodies.
    • Need for higher affinity antibodies for direct measurement of normal aldosterone concentrations.

    Purpose of the Study:

    • Develop higher affinity antibodies for aldosterone measurement.
    • Establish a sensitive and direct assay for normal aldosterone levels in plasma.

    Main Methods:

    • Generation of higher affinity antibodies with similar specificity to previous ones.
    • Direct measurement of aldosterone in 100 microliter plasma extracts.
    • Assay validation including zero values, parallel displacement, tracer recovery, and precision analysis.

    Main Results:

    • Detection limit of 0.2-0.3 pg.
    • High recovery (97.7%) and strong correlation (0.992) for added aldosterone.
    • Low interassay (10.2%) and intraassay (5.6%) variation.
    • Assay demonstrated specificity against other steroids.

    Conclusions:

    • The developed RIA allows for direct measurement of normal aldosterone concentrations with high sensitivity and specificity.
    • The assay is efficient, processing up to 195 samples daily.
    • This advancement improves diagnostic capabilities for conditions related to aldosterone levels.

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