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Related Experiment Videos

Testing for group a streptococci.

Jane C Dale1, Robert Novak, Patricia Higgens

  • 1Mayo Clinic, Rochester, Minn 55905, USA. dale.jane@mayo.edu

Archives of Pathology & Laboratory Medicine
|November 29, 2002
PubMed
Summary
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Laboratory practices for diagnosing group A streptococcal pharyngitis show room for improvement. Many physician office and small-hospital labs deviate from recommended specimen collection and testing protocols.

Area of Science:

  • Clinical Microbiology
  • Infectious Disease Diagnostics
  • Laboratory Medicine

Background:

  • Group A streptococcal pharyngitis diagnosis is crucial in physician office and small-hospital settings.
  • Current laboratory diagnostic practices require characterization to identify areas for enhancement.

Purpose of the Study:

  • To evaluate laboratory procedures for group A streptococcal pharyngitis diagnosis.
  • To pinpoint opportunities for improving diagnostic accuracy and efficiency.

Main Methods:

  • A voluntary self-assessment questionnaire was administered to 790 laboratories.
  • Laboratories were participants in the College of American Pathologists Excel Microbiology Proficiency Testing Program.

Main Results:

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  • Discrepancies were noted between reported and recommended practices for specimen collection and testing.
  • Key issues included inadequate written procedures (17.8%), improper sample site selection (2%), inconsistent backup cultures after negative rapid tests (57.5%), and delayed report finalization (34.0%).
  • A significant portion of labs (57.9%) applied bacitracin disks directly to primary plates.

Conclusions:

  • Suboptimal laboratory practices for diagnosing group A streptococcal pharyngitis persist in some physician office and small-hospital settings.
  • Targeted interventions are needed to improve adherence to best practices and enhance diagnostic outcomes.