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Related Experiment Videos

Validity of "corrected" calcium values

G D Ryan, J R Masarei

    Clinica Chimica Acta; International Journal of Clinical Chemistry
    |February 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Individual variations in plasma calcium regression coefficients (R) exceed analytical error. Using patient-specific R values creates a more precise calcium reference range, improving diagnostic accuracy for total calcium levels.

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    Area of Science:

    • Clinical Chemistry
    • Biomedical Data Analysis

    Background:

    • Plasma total calcium levels are commonly adjusted for albumin concentration.
    • Existing adjustment methods show significant inter-individual variability not explained by analytical error alone.

    Purpose of the Study:

    • To investigate the variability of individual regression coefficients (R) for plasma total calcium on albumin.
    • To develop and evaluate improved reference ranges for adjusted plasma calcium.

    Main Methods:

    • Analysis of individual regression coefficients (R) for plasma total calcium vs. albumin.
    • Comparison of individual R values against general population and mean R values.
    • Derivation of three adjusted calcium reference ranges using different correction factors.

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    Main Results:

    • Individual regression coefficients (R) exhibit substantial variation beyond analytical imprecision.
    • A significant proportion of individual R values deviate from the general population regression.
    • A reference range utilizing individual-specific R values demonstrated a smaller range compared to those using constant factors.

    Conclusions:

    • Individual regression coefficients for calcium-albumin adjustment are unique and stable over time.
    • Personalized reference ranges for adjusted plasma calcium, based on individual R values, offer enhanced precision.
    • This approach has the potential to improve the clinical utility of plasma calcium measurements.