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Human tear glucose

K M Daum, R M Hill

    Investigative Ophthalmology & Visual Science
    |April 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Human tear glucose levels average 7.5 mg/dl, with individual variations from 3.4 to 12.7 mg/dl. This study refined tear glucose measurement by minimizing reflex tears and accounting for processing delays.

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    Area of Science:

    • Ophthalmology
    • Biochemistry
    • Analytical Chemistry

    Background:

    • Accurate measurement of tear glucose is crucial for non-invasive glucose monitoring.
    • Previous studies reported varying tear glucose concentrations, potentially due to methodological limitations.

    Purpose of the Study:

    • To accurately quantify human tear glucose concentrations using an optimized photometric method.
    • To establish a reliable diurnal profile for tear glucose in a large human cohort.

    Main Methods:

    • Photometric analysis of 875 human tear samples.
    • Implementation of precautions to minimize reflex tear contamination.
    • Corrections for processing delays and time-balanced hourly sampling over 5 days per individual.

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    Main Results:

    • The population's arithmetic mean tear glucose concentration was 7.5 mg/dl (range: 3.4–12.7 mg/dl).
    • The population mode (3.2 mg/dl) aligns with literature, but the higher mean reflects improved methodology.
    • A population diurnal tear glucose profile was established, showing similarities to serum glucose profiles.

    Conclusions:

    • The refined photometric method provides a more accurate assessment of tear glucose levels.
    • Tear glucose exhibits diurnal variations, potentially mirroring serum glucose patterns.
    • This study contributes to the development of non-invasive glucose monitoring techniques.