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A short duration renal acidification test.

U Backman, B G Danielson, M Sohtell

    Scandinavian Journal of Urology and Nephrology
    |January 1, 1976
    PubMed
    Summary
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    This study developed a standardized method to assess kidney acidification capacity. A base excess of -6 mmol/l was identified as the critical level for achieving a urine pH below 5.0.

    Area of Science:

    • Nephrology
    • Renal Physiology
    • Acid-Base Balance

    Background:

    • Previous methods for assessing renal acidification capacity lacked standardization.
    • A clinically applicable method was needed to accurately evaluate kidney function in urine acidification.

    Purpose of the Study:

    • To develop and validate a standardized clinical method for assessing renal acidification capacity.
    • To establish a reference frame for evaluating kidney function based on acid-base balance.

    Main Methods:

    • Studied 19 healthy individuals using short ammonium chloride loading (150 mmol/m2 body surface).
    • Administered ammonium chloride via whole tablets, crushed tablets, capsules, and solution.
    • Measured acid-base status in arterialized capillary blood and analyzed urine pH, titratable acid (TA), ammonium ions (NH4+), and phosphate.

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    Main Results:

    • Urine pH decreased as blood acidosis (base excess) increased.
    • Excretion of TA, NH4+, and phosphate correlated positively with the degree of acidosis.
    • A base excess of approximately -6 mmol/l was identified as the threshold below which urine pH consistently dropped below 5.0.

    Conclusions:

    • The developed method provides a reliable assessment of renal acidification capacity.
    • Established a critical base excess level for achieving significant urine acidification.
    • Offers a clinical frame of reference with tolerance limits for evaluating kidney acidification function.