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A candidate reference method for uric acid in serum. I. Optimization and evaluation

P H Duncan, N Gochman, T Cooper

    Clinical Chemistry
    |February 1, 1982
    PubMed
    Summary
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    A new reference method for measuring uric acid in serum was optimized and validated. This manual enzymatic method using uricase demonstrated minimal interference and excellent precision, making it suitable for clinical use.

    Area of Science:

    • Clinical Chemistry
    • Biochemical Assays
    • Enzymatic Analysis

    Background:

    • Accurate quantification of uric acid in serum is crucial for diagnosing conditions like gout and kidney disease.
    • Existing methods for uric acid measurement may be subject to various interferences and variations in precision.
    • Development of a reliable reference method is essential for standardization and quality control in clinical laboratories.

    Purpose of the Study:

    • To optimize and evaluate a candidate Reference Method for serum uric acid determination.
    • To assess the method's performance regarding interferences, analytical recovery, and precision.
    • To compare the candidate method with existing uric acid assays.

    Main Methods:

    • Optimization of reaction parameters for a manual, enzymatic method utilizing microbial uricase.

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  • Quantification of uric acid via a differential ultraviolet spectrophotometry procedure.
  • Evaluation of the method's freedom from interferences, analytical recovery, and precision.
  • Comparative analysis against five other established uric acid measurement methods.

    • Main Results:

    • The candidate Reference Method exhibited the least interference compared to other assays.
    • All six evaluated methods demonstrated satisfactory analytical recoveries and precision.
    • Results obtained from all six methods showed good agreement, indicating overall reliability.
    • The manual ultraviolet uricase method with Tris buffer was selected as the candidate Reference Method.

    Conclusions:

    • The optimized manual ultraviolet uricase method is a robust candidate for a Reference Method for serum uric acid.
    • The method's minimal interference and high precision support its utility in clinical diagnostics.
    • This validated reference method will contribute to improved accuracy and standardization in uric acid testing.