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Observations on urinary stone weight correlated with composition.

B Otnes

    Scandinavian Journal of Urology and Nephrology
    |January 1, 1983
    PubMed
    Summary

    The weight of upper urinary tract stones correlates with their composition. Heavier stones show a shift from calcium oxalate to triple phosphate, influencing analysis comparisons.

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    Area of Science:

    • Urology
    • Materials Science
    • Analytical Chemistry

    Background:

    • Urinary tract stones vary significantly in weight and composition.
    • Understanding stone weight distribution is crucial for accurate analysis and comparison.
    • Previous studies often lack detailed weight-specific compositional data.

    Purpose of the Study:

    • To correlate the weight of upper urinary tract stones with their qualitative and quantitative analysis findings.
    • To investigate how stone composition changes with increasing weight.
    • To provide data that can help standardize stone analysis and reduce selection bias.

    Main Methods:

    • Analysis of 500 upper urinary tract stones.
    • Correlation of stone weight with qualitative and quantitative compositional analysis.
    • Examination of weight distribution across different stone compositions.

    Main Results:

    • The average stone weight was 725 mg, with 65% weighing less than 200 mg.
    • A shift from calcium oxalate to triple phosphate dominance was observed with increasing stone weight.
    • Component proportions in calcium oxalate stones with apatite were consistent across weight ranges but varied with nuclear composition.

    Conclusions:

    • Stone weight is a significant factor influencing composition, particularly the shift towards triple phosphate in heavier stones.
    • Considering nuclear composition is important for understanding apatite-containing stones.
    • Weight data aids in comparing stone analyses and mitigating selection bias.

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