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Related Experiment Videos

Pushing proficiency testing results to their limits.

W G Miller1, J W Ross

  • 1Medical College of Virginia Hospitals, Virginia Commonwealth University, Richmond, USA.

CAP Today
|October 28, 1999
PubMed
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This summary is machine-generated.

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Proficiency testing (PT) is crucial for laboratory quality control, assessing method performance against peers over time. However, PT results cannot validate accuracy or clinical utility due to matrix interferences and require unadjusted calibration for valid comparisons.

Area of Science:

  • Clinical Laboratory Science
  • Quality Management in Healthcare
  • Analytical Chemistry

Background:

  • Proficiency testing (PT) is integral to laboratory quality control and management.
  • PT assesses method performance against manufacturer specifications using peer group data.
  • Summary reports reflect current user preferences and state-of-the-art methods.

Purpose of the Study:

  • To evaluate the utility of PT in assessing laboratory method performance.
  • To identify the limitations of PT in validating accuracy and clinical utility.
  • To provide guidance on the appropriate use of PT data, especially concerning calibration.

Main Methods:

  • Analysis of PT results from a large group of peer laboratories.
  • Evaluation of interlaboratory imprecision and method performance characteristics.

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  • Assessment of the impact of matrix interferences on PT materials and laboratory methods.

    • Main Results:

    • PT effectively measures interlaboratory imprecision and long-term method performance.
    • PT results are generally unsuitable for validating method accuracy or clinical utility.
    • Matrix interferences commonly affect PT materials and routine laboratory methods, limiting accuracy assessments.

    Conclusions:

    • PT is a valuable tool for monitoring method performance and imprecision over time.
    • Limitations exist in using PT for accuracy validation due to matrix effects.
    • Laboratories must report PT results without calibration adjustments for accurate peer group comparison.