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Kits for enzyme determinations compared: relation between composition and quality.

F P Peters, J C Hafkenscheid

    Clinical Chemistry
    |October 1, 1984
    PubMed
    Summary
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    Enzyme activity test kits from five suppliers were compared. Three kits showed good agreement, while two had up to 10% deviations in enzyme measurements.

    Area of Science:

    • Clinical Chemistry
    • Biochemical Analysis
    • Diagnostic Kit Evaluation

    Background:

    • Standardized enzyme activity assays are crucial for accurate clinical diagnostics.
    • The Dutch recommendations provide a framework for enzyme kit composition.
    • Intercomparison of commercial kits ensures reliability and consistency in laboratory testing.

    Purpose of the Study:

    • To evaluate and compare enzyme activity test kits from different suppliers based on Dutch recommendations.
    • To assess the accuracy and consistency of enzyme measurements (alanine aminotransferase, aspartate aminotransferase, lactate dehydrogenase, gamma-glutamyltransferase, alkaline phosphatase, creatine kinase) across various commercial kits.
    • To determine the influence of kit composition on assay performance.

    Main Methods:

    Related Experiment Videos

  • Five different commercial kits for enzyme activity determination were procured.
  • Enzyme activities in human sera were measured using the kits under standardized conditions.
  • Kit component concentrations were quantified using diverse analytical techniques.
  • Assay results were evaluated and correlated with the precise composition of each kit.

    • Main Results:

    • A significant agreement was observed between the activity measurements and kit compositions for at least three of the evaluated kits.
    • Deviations of up to 10% in analytical evaluations were identified for kits from the remaining two suppliers.
    • These observed deviations could be partially explained by variations in kit component concentrations.

    Conclusions:

    • The study highlights the variability in performance among commercial enzyme activity test kits.
    • While some kits demonstrate excellent inter-agreement and accuracy, others show notable deviations, impacting diagnostic reliability.
    • Further investigation into kit component variations is warranted to improve standardization and ensure consistent clinical laboratory results.