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Related Experiment Videos

Is antiglycolysis required for routine glucose analysis?

K Sazama, E A Robertson, R A Chesler

    Clinical Chemistry
    |December 1, 1979
    PubMed
    Summary

    Serum glucose measurements are clinically acceptable, even when using fluoride-oxalate plasma, as differences observed were minimal and independent of glucose levels. Delays in sample processing slightly increased the serum-plasma glucose difference.

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    Area of Science:

    • Clinical Chemistry
    • Laboratory Medicine
    • Biochemistry

    Background:

    • Accurate glucose measurement is critical for diabetes management and diagnosis.
    • Variations in sample type (serum vs. plasma) and pre-analytical handling can affect glucose assay results.
    • Existing literature suggests potential discrepancies between serum and plasma glucose concentrations.

    Purpose of the Study:

    • To evaluate the clinical acceptability of serum glucose determinations compared to fluoride-oxalate plasma.
    • To quantify the difference in glucose concentrations between simultaneously drawn serum and plasma samples.
    • To assess the impact of pre-analytical variables, specifically sample processing delay, on glucose measurement discrepancies.

    Main Methods:

    • Simultaneous collection of serum and fluoride-oxalate plasma samples from 68 patients.
    • Analysis of glucose concentrations using a continuous-flow glucose oxidase method (AutoAnalyzer II).
    • Linear regression analysis to correlate the time from sample collection to separation with glucose differences.

    Main Results:

    • Fluoride-oxalate plasma glucose concentrations were, on average, 42 +/- 35 mg/L higher than serum glucose.
    • The observed difference between serum and plasma glucose was independent of the glucose concentration range (370-3530 mg/L).
    • A delay in sample separation increased the serum-plasma glucose difference by 0.32 mg/L per minute (15-295 min).

    Conclusions:

    • The observed differences between serum and plasma glucose measurements in this study were smaller than previously reported.
    • The specimen-handling process utilized in the hospital setting supports the clinical acceptability of serum glucose determinations.
    • While pre-analytical delays introduce minor variations, serum glucose measurements are deemed reliable for clinical use.

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