Diagnosing latent tuberculosis in immunocompromised patients measuring blood IP-10 production capacity: An analysis of chronic renal failure patients

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Gunluoglu G., Seyhan E. C., KAZANCIOĞLU R., Gunluoglu Z., Veske N. S., Yazar E. E., ...More

Internal Medicine, vol.54, no.5, pp.465-472, 2015 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 5
  • Publication Date: 2015
  • Doi Number: 10.2169/internalmedicine.54.3245
  • Journal Name: Internal Medicine
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.465-472
  • Keywords: latent tuberculosis infection, chronic renal failure, IP-10, IGRA, TST
  • Istanbul Medipol University Affiliated: Yes

Abstract

Objective Patients undergoing haemodialysis for chronic renal failure-hemodialysis (CRF-HD) are at risk of latent tuberculosis infection (LTBI). The effectiveness of using blood IP-10 production capacity to diagnose LTBI in CRF-HD patients was analysed. Methods The study enrolled 50 CRF-HD patients. Interferon-γ release assay (IGRA) was done using QuantiFERON-TB Gold In Tube (QFG-IT) system. Blood IP-10 production capacity was measured using the QFG-IT system tubes. Tuberculin skin testing (TST) was performed on the same day and the test results were compared. Results TST turned out to be positive in 36.4% of the patients and QFG-IT in 54% of them. After stimulation with specific tuberculosis antigens, blood IP-10 levels increased noticeably. The antigen-stimulated blood IP-10 level was significantly higher in patients who were either TST or QFG-IT positive than in patients whose tests were negative (p=0.0001). Using 4.02 pg/mL as the threshold for stimulated blood logtransformed IP-10 level, good agreement was observed between IP-10 and QFG-IT results (κ=1). Conclusion Blood IP-10 level, which can be measured simply, provides results equivalent to IGRAs for the diagnosis of LTBI in CRF-HD patients.