The Interferon-gamma release assay (IGRA) looks at immune response to TB proteins in blood. It is done for: testing for TB infection, especially after BCG.
General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.
Testing for TB infection, especially after BCG.
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.
Immune response to TB proteins in blood.
Blood
TB infection likely (not proof of active disease).
TB infection less likely.
Reference ranges vary by lab, age and sex — always use the range printed on your own report.
Consult a doctor to interpret results — a single test does not make a diagnosis.
Uses your location once to list the nearest facilities. Nothing is stored.
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.
Why is Interferon-gamma release assay (IGRA) done?
Testing for TB infection, especially after BCG.
Do I need to prepare or fast for Interferon-gamma release assay (IGRA)?
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.
SI text CC BY 4.0; decoder reference data (cited per range); LOINC codes free with attribution (notice included).
Sources: SI health summary (own words); MedlinePlus Lab Tests and CDC as references