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Cholesterol operational process specifications for assuring the quality required by CLIA proficiency testing.

J O Westgard1, D A Wiebe

  • 1Department of Pathology and Laboratory Medicine, Medical School, University of Wisconsin, Madison 53792.

Clinical Chemistry
|November 1, 1991
PubMed
Summary

Laboratory testing quality in the U.S. lacks consistent specifications. This study proposes models for cholesterol testing, ensuring analytical and clinical quality requirements are met for reliable laboratory operations.

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Area of Science:

  • Clinical Chemistry
  • Laboratory Quality Management
  • Medical Diagnostics

Background:

  • Current U.S. regulations for laboratory test quality lack standardization.
  • Existing guidelines, like Clinical Laboratory Improvement Act (CLIA) and National Cholesterol Education Program (NCEP), offer disparate requirements for analytical performance and clinical interpretation.
  • This inconsistency hinders routine laboratory operations and quality control.

Purpose of the Study:

  • To develop a coherent framework for establishing practical laboratory testing process specifications.
  • To derive routine operating process specifications for imprecision, inaccuracy, and quality control from analytical and clinical requirements.
  • To demonstrate the utility of an analytical "total error" model and a clinical "decision interval" model for achieving consistent quality standards.

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Main Methods:

  • Utilized an analytical "total error" model and a clinical "decision interval" model.
  • Derived routine operating process specifications from existing analytical and clinical quality requirements.
  • Evaluated cholesterol testing processes against proposed specifications.

Main Results:

  • Developed logically consistent and numerically comparable specifications for laboratory testing quality.
  • Demonstrated that a cholesterol testing process meeting the Clinical Laboratory Improvement Act (CLIA) analytical requirement also satisfies the National Cholesterol Education Program (NCEP) clinical requirement.
  • Identified specific operational specifications for cholesterol testing: allowable CV ≤ 2%, allowable bias ≤ 1%, and specific control rules (1(3)s, 1(2.5)s, or 1(3)s/2(2)s/R4s) for 90% assurance.

Conclusions:

  • The proposed models provide a unified approach to laboratory quality specifications.
  • Achieving CLIA analytical standards ensures NCEP clinical relevance for cholesterol testing.
  • Defined operational parameters enhance the reliability and quality assurance of routine laboratory testing processes.