Quantiferon TB Gold
The QuantiFERON-TB Gold Test is a blood test that aids in identifying Mycobacterium tuberculosis infection, encompassing both latent tuberculosis infection (LTBI) and active TB disease. It measures the immune system's release of interferon-gamma (IFN-γ) in response to TB-specific antigens. Unlike the traditional tuberculin skin test (TST), this assay is not influenced by prior Bacille Calmette-Guérin (BCG) vaccination, reducing the likelihood of false-positive results.
Test details
Sample type
Blood
Time of day
Cannot be collected on a Friday
Fasting required
No
Results timeframe
Within 7 days
Preparation
No special preparation required
What's measured in this test
Quantiferon Gold
Blood test for latent TB infection.
Common reasons for testing
- Screening for latent TB infection – Particularly in individuals at increased risk due to exposure or underlying health conditions.
- Evaluating suspected active TB disease – As part of a comprehensive diagnostic assessment.
- Pre-employment health assessments – Especially for healthcare workers or those in environments with elevated TB exposure risk.