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Problems with the gas-calibrated PCO2 electrode.

N T Bateman, T I Musch, C A Smith

    Respiration Physiology
    |August 1, 1980
    PubMed
    Summary
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    Accurate measurement of blood PCO2 requires calibration with blood or buffer, not just gases. Radiometer PCO2 electrodes showed errors when calibrated with gases, especially at high PCO2 levels.

    Area of Science:

    • Clinical Chemistry
    • Biomedical Engineering
    • Respiratory Physiology

    Background:

    • Accurate measurement of partial pressure of carbon dioxide (PCO2) is critical in clinical diagnostics.
    • Standard calibration methods for PCO2 electrodes using gases may introduce inaccuracies when measuring blood samples.

    Purpose of the Study:

    • To investigate the accuracy of Radiometer PCO2 electrodes when calibrated with gases versus blood or buffer.
    • To identify the source of measurement discrepancies between gas and blood PCO2 readings.

    Main Methods:

    • Measurement of PCO2 in tonometered human blood using three different Radiometer PCO2 electrodes and blood gas analysis systems.
    • Calibration of electrodes with humidified gases, tonometered human blood, and buffer solutions.
    • Repeated measurements and calibration across a wide PCO2 range were performed.

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    Main Results:

    • Electrodes calibrated with humidified gases accurately measured gas PCO2 but showed consistent errors in human blood PCO2.
    • Calibration with tonometered blood or buffer yielded accurate human blood PCO2 measurements.
    • Measurement errors were greatest at high PCO2 and varied across different species (human, rat, dog, goat).

    Conclusions:

    • Calibration of PCO2 electrodes with gases leads to systematic errors when measuring blood.
    • Accurate blood PCO2 determination necessitates calibration using tonometered blood or buffer solutions.
    • The observed discrepancies are not attributable to electrode memory or CO2 exchange with the electrode itself.