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Diagnostic pitfalls in Clostridium difficile infection.

Tim Planche1, Mark H Wilcox2

  • 1Division of Cellular and Molecular Medicine, Centre for Infection, University of London, St. George's Hospital, Cranmer Terrace, London SW17 0RE, UK.

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|January 18, 2015
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Summary

Accurate diagnosis of Clostridium difficile infection (CDI) relies on laboratory confirmation. Detecting C. difficile toxin in stool is preferred for reliable CDI detection over organism-based tests.

Keywords:
Clostridium difficileCultureCytotoxin assayDiagnostic accuracyImmunoassayNucleic acid amplification test

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Area of Science:

  • Clinical microbiology
  • Infectious diseases
  • Diagnostic testing

Background:

  • Accurate diagnosis of Clostridium difficile infection (CDI) is crucial for patient care, epidemiology, and research.
  • Clinical differentiation of CDI from other healthcare-associated diarrheal causes is unreliable.
  • Laboratory confirmation is essential for diagnosing CDI.

Purpose of the Study:

  • To highlight the importance of laboratory confirmation for Clostridium difficile infection (CDI) diagnosis.
  • To compare the utility of different diagnostic assays for CDI.
  • To identify the preferable method for CDI detection.

Main Methods:

  • Review of current diagnostic assays for CDI, including nucleic acid amplification tests (NAATs), immunoassays for C. difficile toxin, and glutamate dehydrogenase (GDH) assays.
  • Comparison of assay performance characteristics, focusing on sensitivity and specificity for CDI detection.
  • Evaluation of the clinical utility of detecting free C. difficile toxin versus detecting the organism itself.

Main Results:

  • Rapid commercial assays like NAATs and immunoassays have largely replaced older diagnostic methods for CDI.
  • Assays detecting free C. difficile toxin in feces are less frequently positive compared to organism-based tests.
  • Despite lower positivity rates, toxin detection assays are considered preferable for accurate CDI diagnosis.

Conclusions:

  • Laboratory confirmation is indispensable for diagnosing Clostridium difficile infection.
  • While various rapid assays exist, direct detection of C. difficile toxin in stool offers a more reliable diagnostic approach.
  • Choosing the appropriate diagnostic assay is critical for effective patient management and epidemiological surveillance of CDI.