Differential diagnosis of tuberculous and malignant pleurisy using pleural fluid adenosine deaminase and interferon gamma in Taiwan

Yung Ching Liu, Susan Shin-Jung Lee, Yao Shen Chen, Hui Zin Tu, Bao Chen Chen, Tsi Shu Huang

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Accurately differentiating tuberculous pleurisy from lung cancer is important for disease management but difficult using conventional laboratory methods. This study assessed the value of adenosine deaminase (ADA) and interferon gamma (IFN-γ) for differentiating the two conditions in a region of Taiwan with a high prevalence of tuberculosis. The study population comprised patients with lymphocytic exudative pleural effusions: tuberculous (n= 24) and malignant (n= 42). Mean levels of ADA and IFN-γ in pleural fluid, measured with commercial standardized kits, were significantly higher for tuberculous than for malignant pleurisy (p< 0.001 for both). For differentiating the two effusions, results for ADA versus IFN-γ were: sensitivity, 70.8% versus 91.7%; specificity, 95.2% versus 97.6%; positive predictive value, 89.5% versus 96.7%; and negative predictive value, 85.1% versus 95.3%. IFN-γ allows precise diagnosis of pleural tuberculosis, but ADA is easier to use, has a low cost, and results are quickly available. Our study confirms previous studies and extends the usefulness of these diagnostic methods to a wider group of clinical laboratories by showing the reliability of standardized relatively inexpensive commercial kits. We recommend that initial ADA screening be used in conjunction with IFN-γ measurements for differential diagnosis of tuberculous pleurisy.

Original languageEnglish
Pages (from-to)88-94
Number of pages7
JournalJournal of Microbiology, Immunology and Infection
Issue number2
Publication statusPublished - Apr 2011


  • Adenosine deaminase
  • Interferon gamma
  • Malignant pleurisy
  • Pleural effusion
  • Tuberculous pleurisy

ASJC Scopus subject areas

  • Immunology and Allergy
  • General Immunology and Microbiology
  • Microbiology (medical)
  • Infectious Diseases


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