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Rapid diagnostic tests for group A streptococcal pharyngitis: a meta-analysis.

Wei Ling Lean1, Sarah Arnup2, Margie Danchin3

  • 1Department of General Medicine, Royal Children's Hospital, Melbourne, Australia;

Pediatrics
|September 10, 2014
PubMed
Summary

Rapid antigen diagnostic tests (RADTs) accurately diagnose group A streptococcal (GAS) pharyngitis, improving sore throat management. Molecular RADTs show the highest sensitivity for GAS detection in primary care settings.

Keywords:
group A streptococcuspharyngitisrapid testsensitivityspecificity

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Area of Science:

  • Infectious Diseases
  • Diagnostic Medicine
  • Microbiology

Background:

  • Group A streptococcal (GAS) pharyngitis diagnosis relies on throat culture, a time-consuming gold standard.
  • Rapid antigen diagnostic tests (RADTs) offer a faster alternative but face concerns regarding accuracy and variability.
  • Improving diagnostic methods for GAS pharyngitis is crucial for effective patient management.

Purpose of the Study:

  • To systematically review and meta-analyze the diagnostic accuracy of RADTs for GAS pharyngitis.
  • To evaluate the sensitivity and specificity of RADTs compared to throat culture.
  • To assess RADT performance in pediatric populations.

Main Methods:

  • Systematic review and meta-analysis of studies published between 1996 and 2013.
  • Inclusion of 48 diagnostic accuracy studies using throat culture as the reference standard.
  • Bivariate random-effects regression to estimate pooled sensitivity and specificity.

Main Results:

  • Overall RADT sensitivity was 0.86 (95% CI 0.83-0.88) and specificity was 0.96 (95% CI 0.94-0.97).
  • Diagnostic accuracy estimates for pediatric data were comparable to overall estimates.
  • Molecular-based RADTs demonstrated superior diagnostic accuracy among tested methods.

Conclusions:

  • RADTs provide accurate diagnosis for GAS pharyngitis, streamlining primary care management.
  • Negative RADT results may not require confirmatory culture in low-incidence rheumatic fever settings.
  • While molecular RADTs offer high sensitivity, they are not yet true point-of-care tests.