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Related Experiment Videos

Calculated vs measured plasma osmolalities revisited.

C I Bhagat, P Garcia-Webb, E Fletcher

    Clinical Chemistry
    |October 1, 1984
    PubMed
    Summary

    This study compared plasma osmolality calculation formulas. A new formula, 1.89 Na + 1.38 K + 1.03 urea + 1.08 glucose + 7.45, proved most accurate for computer use.

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    Area of Science:

    • Clinical Chemistry
    • Biomedical Engineering

    Background:

    • Accurate plasma osmolality measurement is crucial for diagnosing and managing various medical conditions.
    • Existing formulas for calculating plasma osmolality have varying degrees of accuracy.

    Purpose of the Study:

    • To evaluate the accuracy of different formulas for calculating plasma osmolality.
    • To identify the most accurate formula for clinical use and computer integration.
    • To propose a simplified formula for manual calculations.

    Main Methods:

    • Measured osmolalities of 100 plasma samples.
    • Calculated plasma osmolalities using multiple established formulas, including the Dorwart and Chalmers formula.
    • Developed and validated a new "most accurate" formula: osmolality = 1.89 Na + 1.38 K + 1.03 urea + 1.08 glucose + 7.45.
    • Proposed a simplified formula for manual calculations: osmolality = 1.86 (Na + K) + glucose + urea + 10.

    Main Results:

    • The Dorwart and Chalmers formula yielded less accurate results compared to the newly developed formula.
    • The proposed "most accurate" formula demonstrated superior precision in calculating plasma osmolality.
    • The simplified formula offers a practical alternative for manual calculations, reducing potential errors.

    Conclusions:

    • The formula osmolality = 1.89 Na + 1.38 K + 1.03 urea + 1.08 glucose + 7.45 is recommended for computer-based osmolality calculations.
    • A simplified formula, osmolality = 1.86 (Na + K) + glucose + urea + 10, is suitable for manual calculations due to its ease of use and reduced error potential.

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