Interferon-gamma release assay (IGRA)

Why it is done

Testing for TB infection, especially after BCG.

Preparation

No fasting needed. Laboratory-specific; see the reference range on your report. High or positive may mean: TB infection likely (not proof of active disease). Low or negative may mean: TB infection less likely. General information, not a diagnosis. Results must be interpreted by a qualified health worker.

What it measures

Immune response to TB proteins in blood.

Sample type

Blood

If the result is high

TB infection likely (not proof of active disease).

If the result is low

TB infection less likely.

संबंधित स्थितियाँ

entry-health-condition-tb

यह कहाँ कराएँ

सामान्य प्रश्न

What does the Interferon-gamma release assay (IGRA) measure?
Immune response to TB proteins in blood.

Why is the Interferon-gamma release assay (IGRA) done?
Testing for TB infection, especially after BCG.

Do I need to fast for the Interferon-gamma release assay (IGRA)?
No fasting needed.

What does a high or positive Interferon-gamma release assay (IGRA) mean?
TB infection likely (not proof of active disease).

What does a low or negative Interferon-gamma release assay (IGRA) mean?
TB infection less likely.

What is the normal range for the Interferon-gamma release assay (IGRA)?
Laboratory-specific; see the reference range on your report.

Interferon-gamma release assay (IGRA) क्यों किया जाता है?
Testing for TB infection, especially after BCG.

Interferon-gamma release assay (IGRA) के लिए तैयारी/उपवास चाहिए?
No fasting needed. Laboratory-specific; see the reference range on your report. High or positive may mean: TB infection likely (not proof of active disease). Low or negative may mean: TB infection less likely. General information, not a diagnosis. Results must be interpreted by a qualified health worker.