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Related Experiment Videos

[False-positive interferon-gamma test?].

M Priwitzer1, C Unger, F Spieth

  • 1Landeshauptstadt Stuttgart, Gesundheitsamt, Stuttgart. martin.priwitzer@stuttgart.de

Pneumologie (Stuttgart, Germany)
|March 8, 2007
PubMed
Summary
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Interferon-gamma tests aid latent tuberculosis infection diagnosis. A case study revealed potential false positives with QuantiFERON-TB Gold In-Tube, highlighting diagnostic challenges.

Area of Science:

  • Infectious Diseases
  • Immunology
  • Diagnostic Medicine

Background:

  • Interferon-gamma release assays (IGRAs) are increasingly used for latent tuberculosis infection (LTBI) diagnosis.
  • IGRAs like QuantiFERON-TB Gold In-Tube and T-SPOT.TB offer higher specificity than tuberculin skin tests (TST).

Observation:

  • A case involving a woman without LTBI risk factors presented discordant results across IGRA tests and TST.
  • The patient showed conflicting outcomes between QuantiFERON-TB Gold In-Tube, T-SPOT.TB, and TST.

Findings:

  • The QuantiFERON-TB Gold In-Tube test yielded repeatedly discordant results compared to T-SPOT.TB and TST.
  • These findings suggest potential false-positive results from the QuantiFERON-TB Gold In-Tube assay in this specific case.

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Implications:

  • Discordant results in LTBI testing necessitate careful interpretation and further investigation.
  • The study underscores the importance of considering potential false positives in IGRA diagnostics.
  • Clinical decisions for LTBI management should account for the limitations and variations between different diagnostic tests.